A store sells hardcover books for $8 and paperback books for $5. You buy 7 books, represented by the equation x + y = 7, where x is the number of hardcover books and y is the number of paperback books. The equation 8x + 5y = 38 represents the total cost. How many of each type of book did you buy?
Answers
Answer:
so paperback books is 25 and the hardcover book is 64
Step-by-step explanation:
you multiply the cost by the number of how much there is and bam you got it
Related Questions
Q#1: Amanda and Lisa are playing games at the arcade. Amanda started with $15, and the machine she is playing costs $0.75 per game. Lisa started with $13, and her machine costs $0.50 per game. After how many games will the two girls have the same amount of money remaining?
Q#2:The Lone Star Shipping Company charges $14 plus $2 a pound to ship an overnight package. Discount Shipping Company charges $20 plus $1.50 a pound to ship an overnight package. For what weight is the charge the same for the two companies?
Answers
We know Deanna started with $15 and she spends 0.75 per game, so we can make the following equation:
D = 15 - 0.75x
Let L = the amount of money Lisa has after x games.
We know Lisa started with $13 and she spends 0.50 per game, so we can make the following equation:
L = 13 - 0.5x
The question is asking how many games need to be played for L and D to be equal, so just equate L and D and solve for x:
D = L
15 - 0.75x = 13 - 0.5x
15 - 13 = -0.5x + 0.75x
2 = 0.25x
2 = (1/4)x
8 = x
Therefore they need to play 8 games each to have the same amount of money.
Answer: For question one its 8
Step-by-step explanation: Let A be the variable for Amanda! The amount of money she has for x amount of time. We know that lisa has $13 and she is spending .50 every game. The equation for this would be L=13-0.5x. SO to solve this problem of when they both will have the same amount of money use the equation. 15- 0.75x=13 - 0.5x then you will switch the equation around. So the next step would look like 15-13= -0.5x + 0.75x! Then you'll get 2=0.25x change that to a fraction and you'll get 1/4 and 8=x!
Im so sorry if this is confusing!
Bobby buys 6 candy bars for $1.74. At the same price, how many more candy bars can he buy for $20.88?
Group of answer choices
10
2
6
5
Answers
Answer:
Step-by-step explanation:
If Bobby buys 6 candy bars for 1.74
one candy costs 1.74/6=0.29 dollars
for 20.88 he will buy
20.88/0.29=72
Answer:6
Step-by-step explanation:
Which expression is NOT equivalent to 16x + 20y?
3(4x + 18y)
6x + 9y + 10x + 11y
4(4x + 5y)
8(2x) + 20y
Answers
Answer:
3(4x+18y) is not
Step-by-step explanation:
this equals 12x + 54y not 16x +20y!!!
A local Starbucks is tracking the purchases made by its customers. On Saturday 60% of the customers who purchased donuts also purchase drinks. There were 85 customers who purchased donuts on Saturday. How many of these 85 customers also purchase drinks?
Answers
Answer:
51
Step-by-step explanation:
I think
Lucymarrisa u still there? I have a question for you I will put in comments (Mathematics)
Answers
Answer:
This is not a chatting place, OK!
Step-by-step explanation:
Tammy must run more than 73 miles total to reach her fitness goals. She has already run 33 miles and runs 5 miles per day. Which of the following inequalities could be used to solve for x, the number of days Tammy still needs to run to reach her fitness goals?
Plz quick! Due in 5 mins
Answers
Answer:
8 more days
Step-by-step explanation:
40<5x
x>8
mark me brainliest if the answer is correct, thank you in advance :)
A notha wun ........
Answers
Y-intercept is 21
Equation is y=-1/5x+21
Yes it’s proportional :)
Answer:
Slope is -1/5, Y-intercept is 21, Equation is y=-1/5x+21, It’s proportional
Step-by-step explanation:
Brainliest if correct pls
A car is traveling at a steady speed. It travels 2 1/2 miles in 3 1/3 minutes. How far will it travel in 45 minutes? In 1 hour? The car will travel nothing miles in 45 minutes.
PLEASE HURRY IM TIMED!!!!! PLEASE HELP!!!
Answers
Answer:
it will travel 18 miles in 45 min. and 30.5 in 1 hr.
Step-by-step explanation:
divide 45 by 2 1/2
divide 60 by 2 1/2
Which of the following data sets has the mean, median, and mode as the same number?
A. 1,2,3,3,5,6
B. 2,3,4,4,5,7
C. 4,7,11,11,16,17
D. 10,10,12,12,13,13
Answers
Answer:
may be D
Step-by-step explanation:
Brainliest to the first right, :))))
Answers
Answer:
y=8
Step-by-step explanation:
HELP! FINALSS!
The table below represents items on sale at a local department store.
Item Regular Price (r) Discount (d) Sale Price (s)
Detergent $7.00 $1.75 $5.25
Bath towel $9.00 $2.25 $6.75
Shower curtain $11.00 $2.75 $8.25
Toilet paper $13.00 $3.25 $9.75
Which of the following equations represents how to calculate the discount for any of these items?
A. d = r/4 x 3
B. d = r x 0.25
C. d = r/0.25
D. d = r - 1.75
Answers
Answer:hello i am a 7th grade teacher and you cant ask help for finals
Step-by-step explanation:
Put these fractions in order from greatest to least:3/4 ,3/5 ,2/3 .
Answers
Answer:
3/4, 2/3, 3/5
Step-by-step explanation:
3/4 = 0.75
3/5 = 0.6
2/3 = 0.666...
0.75 > 0.666... > 0.6
Therefore, the fractions from greatest to least are:
3/4, 2/3, 3/5
Hope this helps.
3/4 ,2/3.
,3/5 so yea
Use expansion shown to simplify the expression 1/2(3x-2/3y)+3(x/2+1/2y) I’m giving brainliest
Answers
Answer: 1 1/6
Step-by-step explanation:
They already added the x for you so all you had to do was combine the y.
-1/3 +3/2
then you find the common denominator
-2/6 + 9/6 = 7/6
therefore you should get 1 1/6
Answer:
7/6
Step-by-step explanation:
A family of 12 went to the local Italian restaurant for dinner. Every family member ordered a drink and meal, 4 ordered an appetizer, and 8 people ordered cake for dessert. Write an Expression
Please help asap
Answers
Answer:
12d + 12m + 3 ap + 6c
Step-by-step explanation:
d= drink
m=meal
ap= appetizer
c=cake
Answer:
12d + 12m + 3 ap + 6c
Step-by-step explanation:
m=meal
d= drink
c=cake
ap= appetizer
You have explored how to multiply two integers when one is positive and the other is negative. Is the product of a positive integers and a negative integer always is negative?
Can you explain and give one example pls
Answers
Answer: Yes the product of a negative and positive integer will be a negative because multiplying with negatives have rules and this is a rule that’ll be true for any number. For example 7 times -2 is -14 where as -7 times -2 would be 14 and 7 times 2 would be 14
Step-by-step explanation:
when subtracting with negative numbers, change the problem to an ____problem and ____
Answers
Answer: addition problem and add the negatives
Step-by-step explanation:
2 negatives cancel out and switch to a positive +
Solve the system of equations by substitution. Write your solution as an ordered pair
x+y=81
y=8x
Answers
9x = 81, x = 9
y = 8(9), y = 72
Solution: (9, 72)
Answer:
Step-by-step explanation:
Frt
A time line is a useful way to represent important dates and events throughout history. It's common to divide a historical time line into events that occurred either BC (to the left of zero) or AD (to the right of zero). The year you're living in right now takes place in AD. BC AD 0 When performing mathematical operations involving dates, we can think of a historical time line as a number line. On the number line, the years increase from left to right. If zero represents the origin, the years to the right of zero are considered positive numbers and the years to the left of zero are considered negative numbers. Using this analogy, here are some events that might appear on a historical number line:
Event Historical Time Line Number Line
(The first ancient games take place in Olympia, Greece. 776 BC -776)
(Construction begins on the Great Wall of China. 221 )
(BC -221 World War I begins in central Europe. AD 1914 1,914 (or 1914)
Use these ideas about time lines and number lines to answer the questions that follow.
Part A The year in which the US Civil War ended was 25 percent later than the year Christopher Columbus set sail from Spain. If c represents the year Columbus set sail, we can write the year the Civil War ended as C +0.25c.
Rewrite this expression as a single term.
Answers
Hope this helps!!
This shoebox is a right rectangular prism with dimensions of 30 cm by 15 cm by 12 cm.
What is the surface area of this shoebox?
Answers
Answer:
d. 1980 cm2
Step-by-step explanation:
dimentions area total
base 30x15 450cm2 900cm2
face1 12x15 180cm2 360cm2 *add to get
face2 30x12 360cm2 720cm2
plus i got it right ;) 1980*
Can someone pls help me with this thx
Answers
Answer:
The y-intercept in coordinate form is (0, 2.9), which the y-intercept represents the pickup fee which is $2.90 before any mileage
Step-by-step explanation:
Hello, I do apologize that no one responded for two hours.
1 - Understanding what it means to be a y-intercept
When mathematics presents the "y-intercept" its the unimaginative way of saying "Where the equation crosses the y-axis"
Looking at a graph we can deduce that, the y axis in traditional graphs is always at the x value of 0.
What can this mean for this situation?
We want to find out how much each person with 0 miles or no miles driven.
This will be our pickup fee alone
How can we do this?
Theres multiple ways, however the way I like is to set an equation to zero.
2 - Slope Intercept Form
We need to get it into the slope-intercept form using data given to us to use as our equation.
For reference the slope-intercept form is
y = mx + b
y = y value
m = slope
x = x value
b = y - intercept
2.1 - Find the slope
for y = mx + b we'll need to find our slope, m, and to do so we use the following formula
[tex]slope = m = \frac{\triangle y}{\triangle x} = \frac{change~in~y}{chnage~in~x} = \frac{y_2 ~ - ~ y_1}{x_2 ~ - ~ x_1}[/tex]
To do this we need to assign x values and y values.
Our total cost is our y value, because its a total, and our variable is x which will be our miles.
(x value is always the variable, and our y value is always the totals)
So now looking at the data;
Gus;
$12.00 for a 6.5-mile journey
Tony;
$15.50 for a 9-mile journey
We can deduce at 6.5 miles we'll pay $12, and at 9 miles we'll pay $15.50
Because 6.5 is less than 9 our x1 and y1 will be deduced from that, and with that in mind, let's solve that equation.
POINT → (x, y)
(6.5, 12)
(9, 15.50)
[tex]\frac{y_2 ~ - ~ y_1}{x_2 ~ - ~ x_1} = \frac{15.50 ~ - ~ 12.00}{9 ~ - ~ 6.5} = \frac{3.5}{2.5} = 1.4[/tex]
Our slope is 7/5, so therefore,
y = mx + b
=
y = 1.4x + b
2.2 - Plug and chug to find our y-intercept, b.
We'll need to plug in a point into the unfinished equation to solve for b
y = 7/5x + b
In this instance let's use (6.5, 12)
(x, y)
12 = 1.4(6.5) + b
12 = 9.1 + b
-9.1 -9.1
2.9 = b
Lets plug that in to our y = mx + b
y = 1.4x + b
↓
y = 1.4x + 2.9
And would you look at that, just by setting up the equation we now know our y-intercept, now if you recall from earlier one of my notes said this:
POINT → (x, y)
This is the same thing as coordinate form I'm assuming, and as a result, we have all the information we need to answer the problem.
3 - Putting it together to answer the problem
POINT → (x, y)
=
Coordinate Form:
=
(x, y)
Now remembering what I said earlier, the y-axis, is always on x = 0
So our y-intercept in coordinate form is;
(0, 2.9)
This means;
The pickup fee is $2.90 which excludes any mileage.
See the answer for it put together
Hope this helps :)
HELP PLS
ada has a new puppy that weighs 9 pounds. It is now at about 20% of its adult weight. Here is a diagram that Jada drew about the weight of her puppy. The adult weight of the puppy will be 45 pounds. How can you see that in the diagram
Answers
Answer:
suck PP for money
Step-by-step explanation:
Five gerbils cost p dollars. How many dollars will it cost to buy g gerbils? How many gerbils can you purchase for d dollars? Clearly demonstrate and explain how you found the answers.
Answers
Answer:
what is p and what is g?????
Step-by-step explanation:
What are the rate of change and the initial value of the function represented by the graph?
The rate of change is 3 and the initial value is 5.
The rate of change is 13 and the initial value is 5.
The rate of change is 5 and the initial value is 3.
The rate of change is 5 and the initial value is 13.
Answers
Mr adkins has 2 packages, each with 6 batteries. He uses 4 of the batteries in a flashlight . How many batteries does he have left?
Answers
Answer:
8
Step-by-step explanation:
2 x 6 = 12
12 - 4 = 8
So, our answer is 8.
Answer:
8
Step-by-step explanation:
6+6=12 , 12-4=8
help please! !!!!! !!!!
Answers
Answer:
I would assume it's all but the second one (earned $60 over the summer=false)
Answer:
A
Step-by-step explanation:
A is more reliable than the others because we don't know what x is. I am so sorry if this is wrong!!!!! I'm sorry didn't see the select all.
how many brainliest yall got in total? I have 38. fewest gets brainliest (bc they need it more)
Answers
Step-by-step explanation:
5 :/ tvtvtvybububunubuybybyb
Answer:
i have 7
Step-by-step explanation:
...
The square below represents one whole. Express the shaded area as a fraction, a decimal, and a percent of the whole
Answers
Answer:
fraction = 57/100
decimal = 0.57
percent = 57%
Step-by-step explanation:
Percent: 57%
Decimal: 0.57
Pls I need help 20 points
Answers
Answer:
Sorry this is hard I tried several solutions and double-checked them but they were all wrong sorry.
Step-by-step explanation:
4x-8y=-24 in to slope intercept form is 1/2x+3
1/2x+3 into standard form is 4x-8y=-24
They are the same equation written in different forms
The distance of one light-year is approximately 9,500,000,000,000 kilometers. What is this distance in scientific notation?
Answers
Answer:
9.5*10^12 km
Step-by-step explanation:
Use the Distributive Property to simply each expression.
8(x+2)
Answers
Answer:
8x+16
Step-by-step explanation: