Which would be a correct step in deriving the summation formula for the geometric series 5+15+45+135+405 + ... ?

1.

2.

3.

4.

Which expression is equivalent to StartRoot StartFraction 55 x Superscript 7 Baseline y Superscript 6 Baseline Over 11 x Superscript 11 Baseline y Superscript 8 Baseline EndFraction EndRoot? Assume x > 0 and y Greater-than 0.

A trampolinist steps off from 15 feet above ground to a trampoline 13 feet below. The function h (t) = - 16t^2+15, where t represents the time in declines, gives the height h, in feet, of the trampolinist above the ground as he falls.

If m□ebd=4x-8 and m□ebc=5x+20, find the value of x and m□ebc

Evaluate the following formulas d = rt Find t.

What is the value of the expression 9 + (fraction 1 over 2) 4 ⋅ 48? 12 15 17 18

Solve the equation. Check you solution. Show work 21 (2-x) + 12x=44

What is the conjugate of - 1-5i?

Perdo bought 8 tickets to a basketball game. He paid a total of 208. Write an equation to determine whether each ticket cost 26 or 28.

Jackson is starting an exercise program. The first day he will spend 30 minutes on a treadmill. He will increase his time on the treadmill by 2 minutes each day. Write an equation for, the time, in minutes, on the treadmill on day d.

The graph represents the feasible region for the system: y 30 Minimize the objective function P = 20x + 16y.