Difference between highest and lowest temperature

The product of sin 30 degrees and sin 60 degrees is same as the product of

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?

Taber invested money in an account where interest is compounded every year. he made no withdrawals or deposits. the function a(t)=525(1+0.05)^t represent the amount of money in the account after t years. how much money did taber origanally invested?