How is 3x3/6 the same as 9x1/6

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

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.

Which statement is true about a number and its additive inverse? a. their product is always one. b. their sum is always one. c. they are always reciprocals of each other. d. their sum is always zero.