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

$25

step-by-step explanation:

25 - 4.50 = 20.5

20.5 / 2 = 10.25

10.25 + 10 = 20.25

20.25 - 12.50 = 7.75

therefore the answer is $25 as shown as the first number.

dc=6 square root of 3 and ac is 12 square root 3

c and d

step-by-step explanation:

square root of 3/2 = 18/c

cross multiply to get 18*2=√3*c

36/√3 * √3/√3 = c

c= 36*√3/3

c=12√3