Help me please I need to do it faster

0.25M + 0.75B + 1.25C - 50 = total money raised

Step-by-step explanation:

0.25 for each muffin so if 78 are sold we do 78*0.25 = 19.5

0.75*56 = 42 for brownies

1.25*30 = 37.5

19.5+42+37.5 = 99

99 -50 = 49

(1, 1), (2,1/4), (3,1/9), (4,1/16) and (1,1/2), (2,1/4), (3,1/8), (4,1/16)

Step-by-step explanation:

Equation:

(1, 1), (2,1/2), (3,1/3), (4,1/4): 1/x

(1, 1), (2,1/4), (3,1/9), (4,1/16): 1/x^2

(1,1/2), (2,1/4), (3,1/8), (4,1/16): 1/2^x

(1,1/2), (2,1/4), (3,1/6), (4,1/8): 1/2x