WILL MARK BRAINLEST!!!!!!
What should be the first step in adding these equations to eliminate y?
8x + 3y = 2
+ 4x - 6y= -7
O A. Multiply the top equation by 4.
O B. Multiply the bottom equation by 8.
C. Multiply the bottom equation by 2.
D. Multiply the top equation by 2.
D. Multiply the top equation by 2.
Answer:
D
Step-by-step explanation:
Given the 2 equations
8x + 3y = 2 → (1)
4x - 6y = - 7 → (2)
Multiplying the top equation (1) by 2 and adding to (2) will eliminate y
16x + 6y = 4 → (3)
Add (2) and (3) term by term to eliminate y
20x + 0 = - 3
20x = - 3 ( y has been eliminated )
I need help with this fast! Thanks!
What is the value of the expression? 9 3/4−2 1/5+1/2
_ -- > Ex: 9 1/7
I need this fast!
Answer: 8 1/20 or 8.05.
Step-by-step explanation: First you would want to make 9 3/4 - 2 1/5 to 39/4 - 11/5. We need to get the LCD or Least Common denominator of 4 and 5, which is 20. The rule is what you multiplied the denominator by you must multiply the numerator by, so our new equation is 195/20 - 44/20, which is 151/20. Now, we have to find the LCD of 2 and 20, which is 10. So 151/20 + 10/20 is 161/20 or 8 1/20.
A6 ft tall man standing next to a tree casts a 8 ft shadow. If the tree is 15 ft tall then how long is its shadow?
Answer:
The tree's shadow is 20 ft long.
Step-by-step explanation:
If you take 6 and 15 and turn it into a fraction 6/15 and take 8 and the missing value (x) and turn that into a fraction 8/x, then you can move to the multiplication.
6/15 *8/x = 6x=120/6
120/6=20
Hope this helps :)
What correlation is shown by the scatter plot?
2x + 49 = -8 (-x-5)
Show your work please :D
Answer:
2x + 49 = -8 (-x-5)
x=-57/2
x=-28.5
because if you substitute x for 28.5, it makes it equal
Step-by-step explanation:
Hope I Helped!!!
$288 is 6/5
of what number?
Answer:
Step-by-step explanation:
$288= 6/5x, x being the number we are looking for
We can then divide 288 by 6/5, which is the same as (288x5)/6
This will give you 240=x, which is $240
i don’t know how to do this and it’s due in an hour someone help please
Answer:
912 divided byt he square root of AB to 5^2
Step-by-step explanation:
Answer:
AB to 5^2
Step-by-step explanation:
Flattykawa -_-
cosa/(1+sina)+cosa/(1-sina)=2seca
prove this:)
Answer:
Please check explanations
Step-by-step explanation:
Using the difference of two squares, the lowest common multiple becomes;
1-sin^2 a
Thus, we have that;
cos a (1-sin a) + cos a (1 + sin a) /1 - sin^2 a
1 - sin^2 a = cos^2 a
That means;
{cos a - cos a sin a + cos a + cos a sin a}/ cos^2 a
= 2cos a / cos^2 a
= 2/cos a
but 1/cos a = sec a
Thus;
2/ cos a = 2 sec a
what is the value of (f – 9)(144)?
За + 2b – 8а + Ь
Please help
Answer:
-5a+3b
Step-by-step explanation:
-5a+3b Combine like terms
log, (5x + 4) = 3x – 4
Answer:
X-4
Step-by-step explanation:
Isolate the variable by dividing each side by factors that don't contain the variable
2(2x + 3)^2– 7(2x + 3) - 4
Answer:
Solution in photo
Step-by-step explanation:
simplify the expression 5^-3
Answer:
It is the 3rd answer, 1/5³. I checked. Happy to help. Brainliest would be thanking.
?• (-10) = 90
Please help I need it now
Answer:
x = -9
Step-by-step explanation:
x • -10 = 90
x = 90/-10
x = -9
Hope this helped! <3
A coat that usually cost $120.00 is marked 1/3 off. What is the sale price of the coat?
Answer:
The sale price would be $80.00
Step-by-step explanation:
1/3 (33%) of $120 is $40.
$120 - $40 = $80
What is the perimeter of the shaded figure?
Square unit
Answer:
16
Step-by-step explanation:
solve the system of equations
−4x+3y=−2
y=x−1
x =
y =
due in a few hours, i'll give brainliest to the correct answer!!!
Answer:
Angle a=45, Angle b=45
Step-by-step explanation:
The angles are complementary angles which means they both add up to 90 degrees. And if angles a and b are equal then its 90/2 which is 45.
Here is a list of numbers:
4.6, 3.9, 6.8, 8.6, 3.5, 0.8, 8.5, 2.8, 2.6
State the mediant
Answer:
median is 3.9
Step-by-step explanation:
You arrange them all from the smallest to the biggest, then cross out pairs from each side till you get the one in the middle
0.8, 2.6, 2.8, 3.5, 3.9, 4.6, 6.8, 8.5, 8.6
How much will a $559.99 LCD TV cost including the sales tax of 6.25%?
please help!!!!!!!!!!!! !!!
Y’all know what to do!
Answer:
The answer is B.
Step-by-step explanation:
Learn it yourself kid.
Answer and Step-by-step explanation:
First, look at the inequality. We see the there is a greater than or equal to sign.
That means the graphs can NOT be C or D, since those graphs only apply to inequalities with the greater than or less than sign.
That leaves us with graphs A and B.
We see the y is greater than the value, so anything above the line is filled in.
That means that graph A is the answer. Which means,
Answer choice B, graph A.
#teamtrees #WAP (Water And Plant)
Given that x is a nonnegative number, a student conjectured that x+3
Which value of x is a counterexample to the student's conjecture?
X= -1/3
X= -3
X= 2
X= 3
Answer:
[tex]x = 2[/tex]
Step-by-step explanation:
Given
Conjecture: [tex]x + 3 < x^2[/tex] --- (Missing)
Required
Which value of x prove the conjecture otherwise
To do this , we simply substitute the values of x in the options
[tex]1.\ x = -\frac{1}{3}[/tex]
This is negative;
So, there is no need to check
[tex]2.\ x = -3[/tex]
This is also negative;
So, there is no need to check
[tex]3.\ x = 2[/tex]
[tex]x + 3 < x^2[/tex]
[tex]2 + 3 < 2^2[/tex]
[tex]5 < 4[/tex]
This value of x is false because 5 is not less than 4
[tex]4.\ x = 3[/tex]
[tex]x + 3 < x^2[/tex]
[tex]3 + 3 < 3^2[/tex]
[tex]6 < 9[/tex]
Mr. Alvarez makes a walkway out of 3 cement slabs. He uses 14 cubic feet of cement to make the walkway. Each square slab has a volume of 4 cubic feet. How many cubic feet of cement is the middle slab?
Need help Pls!!
Answer: [tex]6\ ft^3[/tex]
Step-by-step explanation:
Given
[tex]14\ ft^3[/tex] cement is used
The volume of each square cement slab is [tex]4\ ft^3[/tex]
So, Volume of two square slab=[tex]2\times 4=8\ ft^3[/tex]
The volume of middle slab= Total Volume -Volume of square slabs
=[tex]14-8=6\ ft^3[/tex]
Answer:
6
Step-by-step explanation:
Please help me........
Justin drives 7.5 miles in 15 minutes. If he drove three hours in total at the same rate, how far did he go?
Answer:
Justin drove 90 miles in 3 hours.
Step-by-step explanation:
Given that:
Justin drives 7.5 miles in 15 minutes.
Speed of Justin = [tex]\frac{7.5}{15}[/tex]
Speed of Justin = 0.5 miles per minute
For speed in hours, we will multiply by 60
Speed of Justin = 0.5 * 60 = 30 miles per hour
Distance covered in 3 hours = 30 * 3 = 90 miles
Hence,
Justin drove 90 miles in 3 hours.
The total distance covered by Justin at the same rate is equal to 90 miles.
Given the following data:
Distance A = 7.5 milesTime A = 15 minutesTotal time = 3 hoursConversion:
1 hour = 60 minutes
3 hours = 180 minutes
To determine the total distance covered by Justin at the same rate:
First of all, we would calculate the rate of Justin's speed as follows:
[tex]Speed =\frac{distance}{time} \\\\Speed =\frac{7.5}{15}[/tex]
Speed = 0.5 miles per min.
For the total distance:
[tex]Total\;distance = speed \times total\;time\\\\Total\;distance = 0.5 \times 180[/tex]
Total distance = 90 miles.
Read more: https://brainly.com/question/10545161
An oblique prism with a square base of edge length x United has a volume of 1/2 x3 cubic units. Which expression represents the heights of the prism
Answer:
The answer is x units.
Step-by-step explanation:
We are tasked to solve for the expression that represents the height of the prism. We are given with the following values:
length = x² units
volume = x³ units
We will use the formula below:
V = length x height
x³ = x² * height
height = x³/x units
height = x units
The answer is x units.
Step-by-step explanation:
18. The half-life of a radioactive isotope is 7 years.
Initially, there are 100 grams of the isotope.
Which expression shows the amount of the isotope
remaining after x years?
Answer:
100(0.5)^X/7
Step-by-step explanation:
That is how you would put it ;)
Which equation will not result in a negative answer?
a) Five plus its additive inverse
b) The difference of -4 and -2
c) (-8]
d) The product of a positive integer and a negative integer.
e) 7 - x>-10
D
Step-by-step explanation:
I just took the test and I got it write
Let N be the universal set and A, B, C, D be its subsets given by A={x:xisaevennaturalnumber},B={x:xNandxisamultipleof3} C={x:xNandx 5},D={x:xNandx 10} Find complements of A, B, C and D respectively.
Answer:
[tex]A^{'}[/tex] = {1,3,5,7,9,....}
[tex]B^{'}[/tex] = {1,2,4,5,7,8,10,11,13,14......}
[tex]C^{'}[/tex] = {1,2,3,4,5}
[tex]D^{'}[/tex] = {10,11,12,13,14,15,......}
Step-by-step explanation:
Solution:
It is given that, Universal set is the set of all Natural Numbers.
and
Set A, Set B, Set C, Set D are subsets of Universal set.
A = {x:x is even natural numbers} = {2,4,6,8,10,.....}
B = {x:x ∈ N and x is a multiple of 3} = {3,6,9,12,15,....}
C = {x:x∈ N and x < 5} = {6,7,8,9,10,.....}
D = {x:x ∈ N and x > 10} = {1,2,3,4,5,6,7,8,9}
U = {1,2,3,4,5,6,7,8,9,10,11,........}
Complements:
[tex]A^{'}[/tex] = U-A = {1,2,3,4,5,6,7,8,9,10,11,........} - {2,4,6,8,10,.....}
[tex]A^{'}[/tex] = {1,3,5,7,9,....}
[tex]B^{'}[/tex] = U-B = {1,2,3,4,5,6,7,8,9,10,11,........} - {3,6,9,12,15,....}
[tex]B^{'}[/tex] = {1,2,4,5,7,8,10,11,13,14......}
[tex]C^{'}[/tex] = U-C = {1,2,3,4,5,6,7,8,9,10,11,........} - {6,7,8,9,10,.....}
[tex]C^{'}[/tex] = {1,2,3,4,5}
[tex]D^{'}[/tex] = {1,2,3,4,5,6,7,8,9,10,11,........} - {1,2,3,4,5,6,7,8,9}
[tex]D^{'}[/tex] = {10,11,12,13,14,15,......}