Hello from MrBillDoesMath!
Answer:
Choice C [16,100]
Discussion:
Let "x" be the score needed on the 5th exam to achieve an average score >= 60. Then
(50 + 90 + 66 + 78 + x)/5 >= 60 => (multiply both sides by 5)
(50 + 90 +66 + 78) + x >= 60*5 = 300 =>
(284) + x >= 300 =>
x >= 300 - 284 = 16.
As x is a percent, x <= 100, so the interval is [16, 100], which is Choice C.
Thank you,
MrB
Hey!
This could be rewritten as:
2x + 1 + 5x
We can add like terms together:
7x + 1
Answer:
His sister will be 13 yrs old
Step-by-step explanation:
twice as many as 5 is 10. so the sister is five yrs older than the brother. if you add 5 to 8, you get 13.
<u>5 + 8 = 13</u>
1/15 would be the simplest form 3x5=15
Answer:
27 feet.
Step-by-step explanation:
This is quite simple. As a square has equal lenght and width we can tell that 6x6=36. So each side has a lenght of 6 feet. With only 3 sides needed for fencing, 6x3=27. Mrs. Roberts needs 27 feet of fencing.
