Fill in the blanks.
principal: $450
rate: ?
time: 3 years
interest earned: 67.50
new balance: ?

r=5%

New balance=$ 517.5

Step-by-step explanation:

We use the simple interest formula:

I=prt.

to determine the rate per annum of a principal of $450 that is invested for 3 years and earned an interest of $ 67.5

We substitute to get:

67.5=450×r×3

We simplify to get:

The rate of interest is 5%

The new balance is

Principal + Interest.

The new balance $517.5

ik how do do this just give me a few minutes and i will give it to

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.