Find the z value for x=40 for a normal distribution with μ=30 and σ=5

Find and simplify the difference of the golden ratio and its multiplicative inverse

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

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1