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Rus_ich [418]
3 years ago
10

3. Find f(-2) for the function below. f(x) = 9• (1/5)^x

Mathematics
1 answer:
Anit [1.1K]3 years ago
4 0

Answer: f(-2) = 225

Step-by-step explanation:

Plug in x which is -2 because f(x) = f(-2):

f(-2) = 9 • 1/5^-2

f(-2) = 9 • 25

f(-2) = 225

Hope this helps!

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Circle A’s circumference is 3 times the value of Circle B’s Area. Find Circle B’a radius.
Natali [406]

(side note: your formula C = 2πr^2 is incorrect, it should be C = 2πr)

Answer:

r = 9

Step-by-step explanation:

First let's find the circumference of Circle A. To use the formula we need radius. Since we have a diameter just divide by 2 to get radius. 27 / 2 = 13.5

Now plug that into C = 2πr: 2π*(13.5) = 27π

The question says that the area of circle B is 3x this value, so Circle B's area must be: 27π * 3 = 81π

Now plug that into A = πr^2 and solve for r:

81\pi=\pi r^{2}\\81=r^{2}\\\sqrt{81}=r\\9=r

(edited to correct a brain fart)

5 0
3 years ago
Math help please show work
Allisa [31]

Answer:

Step-by-step explanation:

To overestimate the area would mean that you completely enclose the circle in squares; an 8 x 8 square to b exact. The area of a square with sides measuring 8 is 64. The overestimation is 64.

To underestimate the area would mean that you only count the squares that are completely inside the circle. That would be a 6 x 6 square (even though the 6th squares are a tiny bit outside the circle). A square with sides of 6 has an area of 36. The underestimation is 36.

7 0
3 years ago
A box of pencils costs $10.The total cost (c) as a function of the number of boxes (b) is expressed as c = f(b) = 10b. What is t
denpristay [2]

Answer:

All positive integers and zero

A is correct

Step-by-step explanation:

A box of pencils costs $10

The total cost (c) as a function of the number of boxes (b) is expressed as

c = f(b) = 10b

The function, f(b) = 10b

b is independent variable and c is dependent variable.

For any function find domain using independent variable.

b represents number of boxes.

Number of boxes neither be negative nor decimal.

Possible value of b: {0,1,2,3,4,5,.......}

All positive integers and zero.

Domain: All positive integers and zero

3 0
3 years ago
1. Jenny bought a shirt for $30. The sales tax was 6%. What was the<br> total cost for the shirt?
ahrayia [7]

Answer:

$31.80

Step-by-step explanation:

8 0
3 years ago
In a college of exactly 2660 students, exactly 60 % are male. what is the number of female students?
garik1379 [7]
If 60% out of the 2,660 students are males, then
40% out of t<span>he same 2,660 students are females

Ten the number of females is 40% x 2660 = 0.4 x 2660 = 1,064 females</span>
5 0
3 years ago
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