Rosemary's math grades are 90, 98, 96, 94, and 85. What must her sixth grade be so that her average is 92?

89

Step-by-step explanation:

(90+98+96+94+85+89)/6=89

89

Step-by-step explanation:

= 92 Solve for x. Multiply both sides by 6

463+x = 552  Subtract

x=89

i know the answer is 3

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18