Wouldn’t the answer be 8 and 3
Answer:
78 and 99
Step-by-step explanation:
let x be the first quiz grade and y be the second quiz grade. we can set up this formula:
x+21 = y
and this formula:
2x-57 = y
therefore, x+21 = 2x-57
add 57 to both sides: x+78 = 2x
subtract x from both sides: 78 = 2x-x
simplify: 78 = x
now we know the first quiz grade is 78. we can plug this into the first formula:
78+21 = y
add to get y = 99
Answer:
69.4 inches
Step-by-step explanation:
62 + 72 + 73 + 69 + 71 = 347
347 / 5 = 69.4
