Forty-two divided by seven plus the quantity three divided by six

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

Scott harris can invest $7,000 in a 1-year cd that earns interest at an annual rate of 4 percent compounded monthly. the amount per $1.00 is 1.040742. he can also invest $7,000 in a 1-year cd at annual rate of 4 percent compounded quarterly. the amount per $1.00 is 1.040604. what is the difference in the amount of interest earned for each investment? a) $0.96 b) $0.81 c) $0.87 d) $0.88

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.