To find this answer, we need to multiply 3.57 by 12.

Therefore, 12 planks will cost $42.84.
If you put 91 times 17 in a calculator, you get 1547. 1547 is your answer.
Answer:
-40
-6
51
Step-by-step explanation:
-33+-7 you are adding two negatives
9+(-15) you are adding a negative to a positive which gets you closer to zero
5-(-46) you are subtracting a negative which is adding
It is not differentiable at x=1 since the slope of the tangent line as x -> 1 from the right is 1 while the slope of the tangent line as x->1 from the left is -1