Answer:
the actual total is 722 so maybe 700 since it's closer
Step-by-step explanation:
Answer:
Choice A: x^2−2x+4− 15/x+2
Step-by-step explanation:
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:
D) x = 1 ± √(47)
Step-by-step explanation:
2x² + 3x - 7 = x² + 5x + 39
move all terms to one side:
x² - 2x - 46 = 0
complete the square:
x² - 2x + 1 - 1 - 46 = 0
(x - 1)² - 47 = 0
add 47 to both sides:
(x - 1)² = 47
square root both sides:
x - 1 = ±√(47)
add 1 to both sides:
x = 1 ± √(47)
