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
DanielleElmas [232]
3 years ago
11

I need help with #20

Mathematics
1 answer:
Gnom [1K]3 years ago
8 0
What you did is set πr² equal to A then divide the π by both sides so it will cancel on the right side and keep A over π then square root r to cancel the exponent of 2
You might be interested in
Kevin drove 693 miles in 11 hours. At the same rate, how many miles would he drive in 9 hours
rodikova [14]

Answer:

567 Miles

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
In a café, I order a cup of tea and a piece of cake and it costs £1.10. The next time I order 2 cups of tea and one piece of cak
defon

Answer:

£0.50

Step-by-step explanation:

t = one cup of tea

c = one piece of cake

t + c = £1.10

2t + c = £1.70

the cost increases by £0.60 (£1.70 - £1.10) when you order one more cup of tea which means that one cup of tea costs £0.60

substitute £0.60 into t + c = £1.10

£0.60 + c = £1.10

rearrange to get c = £1.10 - £0.60 = £0.50

so one piece of cake costs £0.50

7 0
3 years ago
Read 2 more answers
If a 60 year old buys a $1000 life insurance policy at a cost of $50 and has a probability of 0.954 of living to age 61 find the
ANTONII [103]

Answer:

The expectation of the policy until the person reaches 61 is of -$4.

Step-by-step explanation:

We have these following probabilities:

0.954 probability of a loss of $50.

1 - 0.954 = 0.046 probability of "earning" 1000 - 50 = $950.

Find the expectation of the policy until the person reaches 61.

Each outcome multiplied by it's probability, so:

E = -0.954*50 + 0.046*950 = -4

The expectation of the policy until the person reaches 61 is of -$4.

6 0
3 years ago
4. When Megan solved this system using the elimination method, she added the equations together and got the equation 4y = 16. Th
Ede4ka [16]
Hi there!

So, our two equations are:
2x + 3y = 20 and
-2x + y = 4

We can see that the x's will cancel out because they're the same number, opposite signs. Then we're left with 4y = 24.

Divide 24 by 4, which is 6.

y = 6, then we plug that in to the first equation for y:
2x + 3(6) = 20
2x + 18 = 20
2x = 2
x = 1

So, she made her first mistake when adding the equations, adding 20 and 4, she somehow got 16. 

The solution to the system is (1,6).

I hope I helped!
6 0
3 years ago
A scientist measure change in the temperature of chemical solution at the start of the experiment , the solutions is at temperat
zhannawk [14.2K]

Answer:

The temperature of the chemical solution after t hours is -14.96-2.9t\;^{\circ}C

Step-by-step explanation:

Given that the initial temperature of the chemical solution, T_0= -14.96^{\circ}C.

The rate of decreasing temperature, R = 2.9^{\circ}C/ hour

So, after t hours, the temperature of the chemical solution will decrease by Rt=2.9t^{\circ}C.

So, the temperature of the chemical solution after t hours,

T=T_0-Rt \\\\\Rightarrow T = -14.96-2.9t\;^{\circ}C

Hence, the temperature of the chemical solution after t hours is -14.96-2.9t^{\circ}C.

4 0
3 years ago
Other questions:
  • Mary is five times older than Julian. If the<br> sum of their ages is 42, how old is Mary?
    6·2 answers
  • Use the normal distribution of fish lengths for which the mean is 11 inches and the standard deviation is 2 inches. assume the v
    5·1 answer
  • A dog pen 10 ft by 30 ft is needed. You need to decide how much fence is needed. What concept is used to solve the problem?
    13·1 answer
  • Can you help me to find the answer please​
    12·1 answer
  • How do you solve 9 tenths minus 13 fiftenths
    14·1 answer
  • It has been reported that men are more likely than women to participate in online auctions. In a recent survey, 65% of repondent
    13·1 answer
  • Avery is buying string and beads to make bracelets for her family and friends. She plans to divide the string into 9-inch pieces
    15·2 answers
  • If you had two = five what would five + seven be
    12·1 answer
  • Do u love school? I while give u brainliest and alot of points to the people who answer first
    8·2 answers
  • Describe the graph of y = -|x + 4| - 5.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!