The sides of a triangle are 4, 7, and 10. The triangle is dilated by a scale factor of 3 to create a new triangle. Find the perimeter of the new triangle.
A
21 units
B
63 units
30 units
D
25 units

Write a story that matches with the expression 42x-5 pls hurry

Which statement justifies why angle ebc measures 90?

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)