total monthly income, $lof a salesman who sells books consists of a basic salary of $400 and
a variable amount, k, which depends on the number of books he sells. for each book he sells,
he receives $5.
(1) ir the salesman sells 50 books in a particular month, find his total income for that month.

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

Is the power produced directly proportional to the wind speed, give reasons for your answer?

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.