1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
zalisa [80]
3 years ago
9

A sphere has a surface area of 60 square feet. Which choice is the best approximation of its radius? Use 3.14 to approximate pi.

Mathematics
1 answer:
timurjin [86]3 years ago
4 0

Answer:

Radius is 2.18

Step-by-step explanation:

We  have been given the surface area of sphere 60 square feet

And formula for area of sphere is 4{\pi}r^2

using {\pi}=3.14

On substituting the values 60=4\cdot 3.14\cdot r^2 we get:

60=4\cdot 3.14\cdot r^2

On simplification we get:

4.77= r^2

\sqrt{4.77}= r

2.18= r

You might be interested in
Simplify -4 + (-3) + 6
Sedaia [141]
Start off with: -4 + (-3) + 6

First of all, when there is a, + sign and a - sign next to each other, the - side wins.
E.g. 1 +- 3 = 1 - 3

So, apply this to our one:
-4 -3 +6

From there you solve, you can do this using the number line method or whatever you are into:
=-7 + 6
=-1
The answer is -1




3 0
3 years ago
A triangle has an area of 10 square feet. The height is 5 feet. What is the length of the base (in feet)?
Nady [450]

Answer:

4 ft

Step-by-step explanation:

A=\frac{1}{2} bh

A=10 h=5

10=\frac{1}{2} b(5)\\

20=5b (multiply both sides by 2)

4=b (divide by 5)

7 0
3 years ago
A sociologist develops a test to measure attitudes towards public transportation, and 27 randomly selected subjects are given th
taurus [48]

Answer:

The margin of error for the 95% confidence interval for the mean score of all such subjects is of 8.45.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 27 - 1 = 26

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 26 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 2.0518

The margin of error is:

M = T\frac{s}{\sqrt{n}}

In which s is the standard deviation of the sample and n is the size of the sample.

In this question:

n = 27, s = 21.4. So

M = 2.0518\frac{21.4}{\sqrt{27}}

M = 8.45

The margin of error for the 95% confidence interval for the mean score of all such subjects is of 8.45.

5 0
3 years ago
A swimming pool is 8 meters long 6 meters wide and 2 meters deep the water resistant paint need for the pool cost $6 per square
Sati [7]

Answer:

Step-by-step explanation:

3 0
3 years ago
Standard form of a line passing through points (1, 3) and (-2, 5)
____ [38]

Answer:

<h2>2x + 3y = 33 </h2>

Step-by-step explanation:

As we move from (-2, 5) to (1, 3), x increases by 3 and y decreases by 2.

Hence, the slope of this line is m = rise / run = -2/3.

Start with the slope-intercept form y = mx + b.

Substitute 3 for y and 1 for x and -2/3 for m:

3 = (-2/3)(1) + b.

Remove fractions by mult. all three terms by 3:

9 = -2 + b, so b = 11, and y = (-2/3)x + 11

Again, mult. all three terms by 3:

3y = -2x + 33, or, in standard form,

<h2>2x + 3y = 33 </h2>
6 0
3 years ago
Other questions:
  • Anyone know this ??
    13·1 answer
  • PLZ HELP ME PLZ ASAP!!!!!
    9·1 answer
  • What is the regular price of a pair of socks paid $76.92 sale price 20% off
    12·2 answers
  • What is the solution to 3x+81=-9?<br><br> x =?
    8·1 answer
  • Use the Pythagorean theorem to find a whole number estimate of the length of the unknown side of the right triangle. ​The length
    11·1 answer
  • Osing Trig to Find a Side Apr 06, 5:40:44 PM In AOPQ, the measure of ZQ=90°, the measure of Z0=26°, and QO = 4.9 feet. Find the
    14·1 answer
  • Lily is redecorating her house. She needs to work out the area of the wall around her
    11·1 answer
  • Liz is using the distributive property to evaluate the expression 27 (36) by using friendlier numbers. Her work is shown below.
    10·1 answer
  • HELPPPPP ASAP!!!! I’m on a limit
    12·2 answers
  • Robert has a marble collection 1/7 of his marbles are blue 2/7 of his marbles are green. What fraction of Robert’s marbles are n
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!