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3 years ago

Image 30 points) math

Mathematics

2 answers:

Rainbow [258]3 years ago

8 0

Answer:

$\pi =\frac{C}{d}$

Step-by-step explanation:

$C=\pi d$

$\pi =\frac{C}{d}$

muminat3 years ago

8 0

Answer:

I'm not 100%sure but i'm think that it is c

Step-by-step explanation:

Hope this helps! May have gotten it wrong really sorry if I did

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A phone company offers two monthly plans. Plan A costs $10 plus an additional $0.15 for each minute of calls. Plan B costs $30 p

Mkey [24]

First, you need to write to expressions to model each situation:

Plan A: 10+0.15x

Plan B: 30+0.1x

Next, set the expressions equal to each other and solve for x:

10+0.15x=30+0.1x

*Subtract 0.1x from both sides to isolate the variable*

10+0.05x=30

*Subtract 10 from both sides*

0.05x=20

*Divide both sides by 0.05*

x=400

The plans would have the same cost after 400 minutes of calls.

To find how much money the plans cost at 400 minutes, plug 400 into either expression. We'll use Plan A:

10+0.15(400)

10+60

The plans will cost $70.

Hope this helps!

3 0

3 years ago

Helphelphelphelphelphelphelp

Nesterboy [21]

i think a. hope it helps

5 0

3 years ago

1. What number decreased by 9 is 25? (0.5 pt)

Blizzard [7]

Answer:

Step-by-step explanation:

x - 9 = 25

x=25+9

x=34

4 0

3 years ago

The national weather service keeps records of rainfall in valleys. Records indicate that in a certain valley the annual rainfall

Setler79 [48]

Answer:

The mean is 95 and the standard deviation is 2

Step-by-step explanation:

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean $\mu$ and standard deviation $\sigma$ , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean $\mu$ and standard deviation $s = \frac{\sigma}{\sqrt{n}}$ .