Write the explicit formula for the geometric sequence.

a1 = -5 a2 = 20 a3 = -80

a. an = -5 • (-4)n

b. an = -5(-4)n-1

c. an = -4(-5)n-1

d. an = -5 • (4)n

How do you write a paragraph proof to prove that the corresponding angles shown are congruent

20 points for the answer. this is for real , don't put random ! a rectangle has a length of 4 centimeters and a width of 7 centimeters. what is the effect on the perimeter when the dimensions are multiplied by 5? the perimeter is increased by a factor of 5. the perimeter is increased by a factor of 20. the perimeter is increased by a factor of 25. the perimeter is increased by a factor of 100.

Given: x - 4x > 0, then the solution set in interval notation is: (-2, 0) true o false