WILL AWARD BRAINLIEST. Pls answer all parts, if you answer incorrectly for points i will report.

A) Area of the sidewalk = R^2 - r^2   - This can be the expression

Step-by-step explanation:

B) Answer = 3.14 * 40 = 125.6m^2

I think I did it right!

One the second part

idrk part a on the second one

Part b)

The scale factor from the first map to the second map can be determined by:

scale factor = (length of trail in first map) / (length of trail in second map)

8 cm / 6 cm = 1.33

The landmark on the first map is a triangle with side lengths of 3mm, 4mm, and 5mm. 

3mm = 3 * 1.33 mm = 3.99mm

4mm = 4 * 1.33 mm = 5.32mm

5mm = 5 * 1.33 mm = 6.65mm

Step-by-step explanation:

Pretty sure this isn't an exponential equation if it doesn't have exponents? But I'll solve it regardless.

Divide both sides by 50 and you'll get x=17/50

If x is the exponent than we can take the natural log of both sides.

x(ln)50=ln(17)

Then divide ln50 on both sides

x=ln17/ln50= 0.72423228087