please help! 25 pts.
Match each equation with the operation you can use to solve for the variable.
options:
Subtract 10.
Divide by 10.
Divide by 5.
Subtract 18.
Multiply by 10.
Add 18.
Add 10.
Multiply by 5.

Find the balance at the end of 4 years if 1000 is deposited at the rate of

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year.how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y