Solve the equation using mental math
a + 1/3 = 6/7

a) 1 3/21
b) 5/10
c) 7/10
d) 11/21

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?