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3 years ago

6

If f(.3)=5 then f^-1(5)=?

1 answer:

snow_tiger [21]3 years ago

6 0

0<span>•3

Hope this helped!</span>

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Todd is 81 years younger than Rosa. 3 years ago, Rosa’s age was 4 times Todd’s age. How old is Todd now?

Delvig [45]

Let t represent Todd's age now.
.. 4(t -3) -(t -3) = 81 . . . . . . 3 years ago, their differnce in ages was 81.
.. 3t -9 = 81
.. t = (81 +9)/3 = 30

Todd is 30 now.

_____
You can also work this by considering "ratio units." 3 years ago, the ratio of their ages was 4:1, a difference of 3. That difference corresponds to 81 years, so each "ratio unit" represents 81/3 = 27 years. Todd's age then was 1 ratio unit, 27 years. Now, Todd's age is 30.

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3 years ago

Whats 1 + 1 = ? I don't know? But if you answer you will be brainiest and get 100 points free!

Arada [10]

2 is your answer lol

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3 years ago

Read 2 more answers

Your waiter at a restaurant suggests you leave a tip of $10 on a $50 bill. What percentage is that?

Bezzdna [24]

Answer:

20%

Step-by-step explanation:

To find what percentage is $10 out of $50, we divide 10 by 50:

$\frac{10}{50}=0.2$

If we want to get the result in percentage form, we simply multiply it by 100%:

$0.2\cdot 100\%=20\%$

So a tip of $10 on a $50 bill is a tip of 20%.

6 0

3 years ago

It's believed that as many as 23% of adults over 50 never graduated from high school. We wish to see if this percentage is the

laila [671]

Answer: 756

Step-by-step explanation:

Given : The proportion of adults over 50 never graduated from high school. = 0.23

Margin of error : E=0.03

Significance level : $\alpha=1-0.95=0.05$

Critical value : $z_{\alpha/2}=1.96$

The formula to find the sample size is given by:_

$n=p(1-p)(\dfrac{z_{\alpha/2}\ }{E})^2$

i.e. $n=(0.23)(0.77)(\dfrac{(1.96)}{0.03})^2=755.941511111approx756$

Hence, the required minimum sample size = 756

4 0

3 years ago

Help me i think its add 24 to both sides

umka2103 [35]

It is given in the question that

Steven is solving the equation

$3(8-2x)+40=34$

He begins with the following two steps.

$Step 1: 3(8)+3(-2x)+40=34 Step 2: 24-6x+40=34$

And we have to find , what will be the next step in solving the equation.

First we combine the like terms. And the like terms are 24 and 40. So we have to add 24 and 40. And that will be the next step.

So the correct option is the last option.

8 0

3 years ago