Given the function rule f(x)= x^-2 - 4x + 3, what is the output of f(-3)?

a. 24
b. 21
c. 0
d. -3

the answer is a but why?

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.

Examine this system of equations. what integer should the second equation be multiplied by so that when the two equations are added together, the x term is eliminated? 3/4x+1/7y=6 1/8x-3/5y=16