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Helen [10]
4 years ago
13

If f(x) =- 3x - 9, find f(5)​

Mathematics
1 answer:
lidiya [134]4 years ago
3 0

Answer:

f(5) = - 24

Step-by-step explanation:

To evaluate f(5), substitute x = 5 into f(x) , that is

f(5) = - 3(5) - 9 = - 15 - 9 = - 24

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Stephanie surveyed the students in her class to find out their favorite color. her results are in the table. what percent of Ste
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Hi there!

To solve this problem, we need to find the amount of classmates out of the entire class who did not choose blue as their favorite color and then convert it into a percentage. 

First, let's find the fraction:

Since there are 25 total people in her class, since

6 + 9 + 10 = 25

25 is the denominator of the fraction;

Since there are 16 people who did not choose blue,

6 + 10 = 16

16 is the numerator of the fraction. 

So, our fraction is 16/25. 

Now, we need to convert it into a percentage. To do this, we need to make the denominator 100 by multiplying it by a certain number, and then multiplying the numerator by that same number so the fraction stays equal:

16/25 
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= 64/100
= 64%

So, the answer is 64% of Stephanie's classmates.

Hope this helps!
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3 years ago
What are the coordinates of r
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The coordinates of r is ( 4, -1 )
5 0
3 years ago
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nexus9112 [7]

Answer:

b

Step-by-step explanation:

5 is one of the numbers in 1,2,3,4,5,6,7,8

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6 0
4 years ago
8/5÷3=______<br>Answer in a fraction form <br><br>PLZ HELP ME​
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Y is directly proportional to square root of x<br> If y=56 when x=49 find,<br> y when x=81
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\qquad \qquad \textit{direct proportional variation} \\\\ \textit{\underline{y} varies directly with \underline{x}}\qquad \qquad \stackrel{\textit{constant of variation}}{y=\stackrel{\downarrow }{k}x~\hfill } \\\\ \textit{\underline{x} varies directly with }\underline{z^5}\qquad \qquad \stackrel{\textit{constant of variation}}{x=\stackrel{\downarrow }{k}z^5~\hfill } \\\\[-0.35em] \rule{34em}{0.25pt}

\stackrel{\begin{array}{llll} \textit{"y" directly}\\ \textit{proportional to }\sqrt{x} \end{array}}{y = k\sqrt{x}}\qquad \textit{we know that} \begin{cases} y = 56\\ x = 49 \end{cases}\implies 56=k\sqrt{49} \\\\\\ 56=7k\implies \cfrac{56}{7}=k\implies 8=k~\hfill \boxed{y=8\sqrt{x}} \\\\\\ \textit{when x = 81, what is "y"?}\hfill y=8\sqrt{81}\implies y=8(9)\implies y=72

7 0
2 years ago
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