3.) Bob spent $780 on books. Math books cost $60 per book and science books cost $70. If he bought a total of 12, then how many of each did he buy?
math books:

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

Find percent notation for 0.008 0.008=

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