What is the slant height of a cone if its surface area is 251 ftand the radius of its base is 4 ft.? Use 3.14 for x and round the answer to the nearest whole number if necessary.
O 50 ft.
O 18 ft.
O 16 ft.
O 8 ft.

Which of the following are accepted without proof in a logical system? check all that apply.

For what values of x is x2 + 2x = 24 true?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)