How Do I Solve These Math Problems? Urgent Please Help?

ok if i dont finish these im getting a zero and it counts as a test grade =[ its already late. so here are the problems i couldint do, and there multiple choice if that makes it easier
1 “jack bought 3 slices of cheese pizza and 4 slices of mushroom pizza for a total cost of 12.50 grace bought 3 slices of cheese pizza and 2 slices of mushroom pizza for a total of 8.50 what is the cost of i slice of mushroom pizza?” (choices 1.50 3.00 2.00 3.50)
2 “pam is playing with red and black marbles. the number of red marbles is three more than twice the number of black marbles she has. she has 42 marbles in all. how many red marbles does pam have?” (choices 13 15 29 33)
3 “what is the product of X squared minus 1 over x plus 1 and x plus 3 over 3x minus 3 expressed in simplest form?” choices (x) (x over 3) (x + 3) (x+3 over 3)
4 “which value of x makes the expression x+4 over x minus 3. undefined?” choices (-4) (-3) (3) (0)
5 “what is the slope of a line that passes through the points (-6,1) and (4,-4)” choices (-2) (2) (-1 over 2) (1 over 2)
6 “the table below shows a cumulative frequency distribution of runners ages
AGE GROUP – TOTAL
20-29 8
20-39 18
20-49 25
20-59 31
20-69 35
according to the table, how many runners are in their forties? choices (25) (10) (7) (6)
7 “which expression represents 2x(squared) minus 12 over x minus 6 in simplest form?” choices (0) (2x) (4x) (2x +2)
8 “what is. square root 32 over 4 expressed in simplest radical form?” choices (square root 2) (4 square root 2) (square root ( square root 8 over 2)
9 “consider the graph of the equation y=ax(squared)+bx+c when a =/ (doesent equal) 0. if a is multiplied by 3, what is the true graph of the resulting parabola?” choices (the vertex is 3 units above the vertex of the original parabola) ( the new parabola is 3 units to the right of the original parabola) (the new parabola is wider than the original parabola) ( the new parabola is narrower than the original parabola)
PLEASEE help me out with these =/