The amount of simple interest earned, n, varies jointly with the rate of interest, r, and the number of years, t. The simple interest earned is $225 when the rate of interest is 4.5% for 4 years. Using the variables r, and t, find the equation that represents this relationship.

$225 = $1250*0.04*4

Step-by-step explanation:

The appropriate formula to use here is i = p*r*t, where p is the principal, r is the annual interest rate as a decimal fraction, and t is the number of years.

Here:

$225 = p*0.045*4 represents this relationship.  p, the principal, is not given, but can be calculated from the above equation:

             $225

p = = $1250

       0.045*4

Then the given relationship is

$225 = $1250*0.04*4

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.

i believe your answer is 99.7% of 7-year-old children are between 46.6 inches and 49.5 inches tall.