Prove that Sn=n(n+1) for the sequence an=2n, where n is any positive integers

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

Use multiples to write two fractions equivalent to 7/9. 14/18, 8/10 6/8, 21/27 10/12, 28/36 14/18, 21/27

Diane’s bank is offering 5% interest, compounded monthly. if diane invests $10,500 and wants $20,000 when she withdrawals, how long should she keep her money in for? round to the nearest tenth of a year.