Anew cell phone costs $85, and the sales tax is 9%. what is the amount of sales tax?

This is a great life skill to learn and something you will use everyday.  To find tax, multiply the cost by the tax rate as a decimal.  Here is how it is done:

cost: $85

tax rate: 9%=0.09 as a decimal

85 times 0.09= 7.65

You will pay $7.65 in taxes on the new cell phone.

this is the formula: v = the value of investment at the end of the time period

p = the principal amount (the initial amount invested)

r = the annual interest rate

n = the annual frequency of compounding (how many times a year interest is added)

t = the number of years the money is invested

^ means raise to the power of