If f(x) = 5х + 40, what is f(x) when x=-5?

Savannah is painting a striped background for a mural on a wall that is 1515 yards long. she wants a total of 9696 stripes that are all the same width. which calculation should savannah use to decide how wide to make each stripe?

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Mrs. gehrke said cheddar weighs 16.8 pounds. he actually weighs 15.2 pounds. what is the percent error?