Alpha and bettas are acute angles, ѕіn a = 3/5, cos b =1/2 then what is the value of cos(a + b) =?

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is 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.