If a + 3b = 13 and a + b = 5, the value of b is?

a. 1
b. 4.5
c. 7
d. 4

The function a represents the cost of manufacturing product a, in hundreds of dollars, and the function b represents the cost of manufacturing product b, in hundreds of dollars. a(t) = 5t + 2 b(t) = 7t - 2t +4 find the expression that describes the total cost of manufacturing both products, a(t) + b(t). a. 7t^2 - 7t + 2 b. 7t^2 + 3 +6 c. 7t^2 + 7t - 6 d. 7t^2 - 3t + 6

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?