An electrician’s savings account had $6,000 when he opened the account. His account had a simple interest rate of 7% for the past 4 years. What is his current account balance?

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?