If the area of a circle is 28.28 square in, then what is its radius? and show work

r = 3 in

This is because 28.28/3.14=9
√9=3

Hello!

The formula for area of a circle is A = πr², where r is the radius. Since you are given the area of the circle, you can plug it for A in the formula and solve algebraically for the radius, r. We'll use 3.14 for π.

A = πr²
28.28 = 3.14r²
28.28 = 9.87r
2.87 = r

The radius of the circle is approximately 2.87 inches.

pH = f(x) = -log₁₀x

1. Graphs

I used Excel to calculate the pH values and draw the graphs (see the Figure).

f(x) and f(x) +1 are plotted against the left-hand axis, while f(x+ 1) is plotted against the expanded right-hand axis.

The points at which pH = 0 and pH = 1 are indicated by the large red dots.

2. x = 0.5

When x = 0.5, pH ≈0.30. The point is indicated by the red diamond.

3. Transformations

(a) ƒ(x) = -log(x) + 1

This function has no y-intercept, because log(0) is undefined.

(b) ƒ(x +1) = -log(x + 1)

f(0) = -log(0 + 1) = -log(1) = 0

This function has a y-intercept at (0,0).

hope this helps please mark me brainliest!