Label your unknown numbers
I'm calling them x and y
x+y=21
5x+2y=66
find a relation of x and y
y=21-x
substitute this into your second equation
5x+2 (21-x)=66
simplify to find x
5x+42-2x=66
3x+42=66
3x=24
x=24/3=8
apply your findings to find the second number
8+y=21
y=13
check your answer
5 (8)+2 (13)=66
40+26=66
we now know that the first number x is 8
and the second number y is 13
She made 20 oatmeal cookies
4/5 = 0.8
0.8 x 25 = 20
11x+55=0
11x=-55
11x/11=-55/11
x=-5
Answer:
The answer is 173.45
Step-by-step explanation:
132.20 + 74.50 - 52 + 18.75 =173.45
I hope this helps
Answer:
The volume of a rectangular pyramid is found using the formula: V = (1/3) × L × W × h, where L x W represents the base area of the rectangular pyramid and h represents its total height.
Step-by-step explanation: