Need
3. simplify the expression x^{2} -2x-3/x^{2} -3x-4÷x-3/2x

4. cos (a+b)= cosacosb-sinasinb, then cos (20+60) is what?

Place the following steps in order to complete the square and solve the quadratic equation,

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

2pointswhich of the following appear in the diagram below? check all that apply. d a. zcdeов. сеo c. aéo d. zdce