What is the z-score with a confidence level of 95% when finding the margin of error for the mean of a normally distributed population from a sample?
0.99
1.65
1.96
2.58

Can someone me i’m confused. will give brainliest and a whole bunch of points

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

F(x)= 4x g(x) =x-1 what is f(x) divided by g(x)