Please help me asap! pleaseee
estimate √9.7+3.88×6.21
9514 1404 393
Answer:
a little more than 27
Step-by-step explanation:
Estimates are generally made by approximating the numbers using 1 or 2 significant digits. The idea is to do as much mental arithmetic as possible, not involving a calculator. Here, the estimate can be based on rounding the values like this:
√9.7 +3.88 × 6.21 ≈ √9 +4 × 6 = 3 +24 = 27 . . . estimated expression value
__
Another aspect of estimating is determining the approximate error involved.
We know that √9.7 will be more than √9 = 3, and less than √10 ≈ 3.16*. Its real value may be about 3.1.
3.88 is less than 4 by 0.12, or 3%. 6.21 is greater than 6 by .21, or 3.5%. So, the estimated product of 24 will be on the order of -3% +3.5% = 0.5% too low. Of course 1% of 24 is 0.24, so 1/2% will be about 0.12. Now, we are able to estimate that our estimate is about 0.2 units too low. (The actual value of the expression is an irrational number that rounds to about 27.2093.)
_____
* The value of 3.16 for √10 is not so hard to remember, because it is just slightly more than π ≈ 3.14.
__
Additional comment
Small percentages can usually be added and subtracted without introducing too much additional error. (The smaller the percentages, the less additional error is introduced.) Here, the error in our estimated product can be more accurately determined by computing ...
(1 -3%)(1 +3.5%) = 1 +0.5% -0.105% = 1 +0.395% . . . . . . (not 1 +0.5%)
That is, our product's actual value is 24.0948, not 24.12.
What is 24% of 100
PLEASEEEE HELP I WILL GIVE BRAINLY POINTS!!!!!!!!!!!!!!!!!
Answer:
24% of a hundred is 24
Step-by-step explanation:
use fractions to help you solve this.
The radius of a sphere is decreasing at a rate of 2 centimeters per second. At the instant when the radius of the sphere is 3 centimeters, what is the rate of change, in square centimeters per second, of the surface area of the sphere? (The surface area S of a sphere with radius r is S = 4πr2.)
Answer:
The rate of change of the surface area of the sphere is;
-48π cm^2/s
Step-by-step explanation:
Here, we want to calculate dA/dt
Mathematically that will be;
dA/dt = dA/dr * dr/dt
From the question;
dr/dt = -2 cm/s
dA/dr = 8πr
So dA/dt will be;
-2cm/s * 8πr = -16 πr cm/s where r is 3 cm
So;
dA/dt = -48π cm^2/s
Using implicit differentiation, it is found that the rate of change of the surface area of the sphere is of -151 square centimetres per second.
The surface area of an sphere of radius r is given by:
[tex]S = 4\pi r^2[/tex]
Applying implicit differentiation, the rate of change is given by:
[tex]S = 8\pi r\frac{dr}{dt}[/tex]
For this problem:
The radius of a sphere is decreasing at a rate of 2 centimetres per second, hence [tex]\frac{dr}{dt} = -2[/tex]It also is of 3 centimetres, hence [tex]r = 3[/tex]The rate of change is of:
[tex]S = 8\pi(3)(-2) = -48\pi = -151[/tex]
The rate of change of the surface area of the sphere is of -151 square centimetres per second.
A similar problem is given at https://brainly.com/question/11496075
HELP!!! PLEASE TELL ME WHICH GRAPH GOES WHERE!!! DON'T IGNORE PLEASE!!!
So y=mx+b is still prevalent here even if it's an inequality. Meaning your slope AND y-intercept can help you. Even if it's in ax+by=c you can easily get the y alone into slope-intercept.
y<_3x+5 for example. For one, it is y is less than or equal to 3x+5. So the line shouldn't be dotted. So that leaves us with the two far-right graphs to look at. 5 is our y-intercept in the equation. So look at our graph and see which one has the line passing through 5. They both do. Okay, well we can still use our sign, it shows that y is LESS than 3x+5. So the shaded blue part should be on the right. If it was the other way around it would be the left. So our graph should be the far right for this equation.
Hope this helps... I know it's kind of messy. If you need any more help let me know. But I hope I outlined what to look for.
Can somebody help me with this ASAP
Answer:
Slope is -2/5 and y-intercept is 4
Step-by-step explanation:
Because of y=mx+b
b is always going to be the y-intercept and mx is going to be the slope.
Answer:
Slope is -2/5 and y-intercept is 4
\
Because of y=mx+b
b is always going to be the y-intercept and mx is going to be the slope.
Step-by-step explanation:
This is because y=mx+b
A new suit costs $678.90 but it is on sale for 40% off. Find the discount and the new price.
Answer:
654.9
hope this can help
Please solve the new value of x !!!!!!! Please HELP !!!!!!! Will mark BRIANLIEST !!!!!!!!!
Answer:
51
Step-by-step explanation:
On what intervals is the graph increasing and or decreasing
Answer:
Using interval notation, it is described as increasing on the interval (1,3). Decreasing: A function is decreasing, if as x increases (reading from left to right), y decreases.
Step-by-step explanation:
PLZ HELP IM TWO WEEKS BEHIND THE SCHOOL CALLED MY MOM
Which describes dependent events?
drawing a blue marble and a yellow marble at the same time from a bag of marbles
drawing the ace of spades from a deck of cards, putting it back into the deck, and
drawing the king of spades.
rolling a six-sided number cube and getting an even number, then rolling the same six-sided number cube and getting an even number again
flipping two coins at the same time and getting heads on one and tails on the other
Answer: Drawing a blue marble and a yellow marble at the same time from a bag of marbles is the example of dependent events.
Step-by-step explanation: When the cards are replaced, or flipping coins or rolling dice, the outcome of the first event does nor affect the probability of the next event.
Drawing two marbles at the same time is essentially the same as drawing one and Not replacing it and then drawing the second one. The number of marbles left affects the probability.
Answer:
A
Step-by-step explanation:
Mrs. Collins made a scatterplot to show the relationship between the number of absences a
student in her class has and the student's final exam score.
Absences vs. Ecam Scores
100
90
.
.
Exam Score
80 70 50
RO
5
Number of Absences
Based on this scatterpiot, approximately what score should a student with 6 absences expect
to receive on the final exam?
A 65
B92
C 67
What is the value of r in the equation?
-1.5(4-r)--12
-6
O4
O
4
O6
Answer:
I am going to say 6 , please let me know if I am wrong :)
Please help me! 8 pts and brainliest!! please
One angle is a complementary pair is twice as large as the other. What is the measure of the larger angle?
a. 30°
b. 60°
c. 90°
d. 120°
Answer:
60 degrees
Step-by-step explanation:LARGE ANGLE...60-degrees
So, we have x + 2x = 90. Solving for x, we get x = 30. Since the first angle was called x, that means it's measurement is 30°. The second angle, 2x, is just twice the first angle, so its measurement is 60°
1/sin30 - √3/cos10 =4 prove it?
Step-by-step explanation:
1/sin10-√3/cos10
= (cos10 - √3sin10)/cos10sin10
multiplying 1/2 in denominator and numerator
= {(cos10/2) - (√3sin10/2)}/(cos10sin10/2)
= (cos60cos10 - sin60sin10)/(cos10sin10/2)
= cos(60 + 10)/(cos10sin10/2)
= cos70/(cos10sin10/2)
= 2cos70/cos10sin10
multiplying 2 on numerator and denominator
= 4cos70/2sin10cos10
=4cos70/sin20
=4cos70/cos70
= 4 proved
Julio says, "If you subtract 11 from my number and multiply the difference by - 6, the result is
-78." What is Julio's number?
Julio's number is
Answer:
Julio's number is 24
Step-by-Step Explanation:
1. 24 - 11 = 13
2. 13 · -6 = -78
Answer:
26
Step-by-step explanation:
I really need help......
the graph shows a proportional relationship. what is the constant proportionality?
Answer:
21
Step-by-step explanation:
21 is the constant of proportionality.
WILL GIVE BRAINLIEST Bryan owes the bank $7. He gets paid $35 for
babysitting and deposits it into his account. What will
his bank balance show?
Answer:
$28
Step-by-step explanation:
$7.95 lunch; 15% tip
Answer:
Ok $1.19 tip.
Step-by-step explanation:
So 7.95 (0.15)= 1.1925
round to nearest dollar, $1.19
Answer:
1.1925 dollars
Step-by-step explanation:
1% of 7.95 is 0.0795
0.0795 x 10 = 0.795
0.0795 x 5 = 0.3975
15% = 1.1925 dollars
Lin runs 2 laps around a track in 8 minutes.
a. How many minutes per lap is that? 4
b. How many laps per minute is that?
c. If Lin runs 21 laps at the same rate, how long does it take her?
Answer:
Part a: 4 minutes
Part b: [tex]\frac{1}{4}[/tex] lap
Part c: 84 minutes or 1 hr and 24 minutes
Step-by-step explanation:
Part a:
Ok so you got part a right, it's 4 minutes.
Part b:
you would do [tex]\frac{2laps}{8min.}[/tex] that will give you [tex]\frac{1}{4}[/tex].
So it's a quarter of a lap per minute.
Part c:
For this one we know that it takes her 4 minutes just to complete one lap, and if they're doing 21 laps that means we'll multiply 21 and 4. That gives us 84 minutes, or 1 hr and 24 min.
The picture above shows the question.
Answer:
angle one is 62 degrees
Step-by-step explanation:
3x+2+5x+18=180
x=20
5*20+18=118
180-118=62
HEEEEEEEELP PLEASE asap
Simplify. - (3x2)0
Please and thank you:)
Answer:
the answer is A
Step-by-step explanation:
CAN SOMEONE PLEASE HELP AND EXPLAIN THIS
Answer:
what are the options? I'll say it in the comments
I need the answer to this question I don’t understand it
The ____is used to measure volume.
Liter
Gram
Meter
Answer: A. A liter is used to measure Volume
the product of the roots of a quadratic equation 2x²-5x+3=0 is 5/2 if it is correct give reason
9514 1404 393
Answer:
It is incorrect. The product is 3/2.
Step-by-step explanation:
The factored form of a quadratic with roots p and q can be ...
a(x -p)(x -q) = ax² -a(p+q) +apq
Then the product of the roots is the ratio of the constant to the leading coefficient:
pq = (apq)/a
In the given quadratic, that product is ...
pq = 3/2 . . . . . . not 5/2
The statement that the product of roots is 5/2 is incorrect. That value does not have the required relationship to the coefficients of the quadratic.
الزاوية في الوضع القياسي التي تكون الزاوية °82 زاوية مرجعية لها هي :
a) 275°
b) 98°
C) 262°
Step-by-step explanation:
340 046 9411Collect the contact numbers of the potential customers (could be friends or relatives initially). Create a whats app broadcast list and send them the new products or offers with image to them regularly.
One more thing that helps is advertisement banners on public places such as bus depot, railway stations, etc…
Last but not the list. A COOL customer experience to the customers even though they do not buy anything.
Hope these helps. There are many other important factors as well. You can ask any time for any help in this. Would be glad to help. :)
Answer:
340 046 9411Collect the contact numbers of the potential customers (could be friends or relatives initially). Create a whats app broadcast list and send them the new products or offers with image to them regularly.
Step-by-step explanation:
Please help, Answers to any of these questions??
Answer:
13) began with 34
Step-by-step explanation:
20 cards replaced and now have 37
37-20=17
17 is half of the baseball cards
17x2= 34 which is what you began with
Help me pls !!!!!!!!!’n
Answer:
x=-31/4
Step-by-step explanation:
Cross multiply and bring 3 to the opposite side.
3(3x+8) =5x-7
9x+24=5x-7
Bring all the x to one side and the numbers to the other
9x-5x=-7-24
4x=-31
x=-31/4