1) a) The formula for simple interest is: b) Rearrange this formula to find:
i) Time:
ii) The interest rate:
iii) The Principal:

in 4 days he will run   12/14

step-by-step explanation:

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6

or