Answer:
he needs to get a 91 to have a mean score of 90
Step-by-step explanation:
add up all the known scores to get 629
let 's' = lowest test score
(629 + s) ÷ 8 = 90 [we divide by 8 because there are 7 known and 1 unknown score)
cross-multiply to get:
629 + s = 720
s = 720-629
s = 91
Answer:
the first one is 19-11
Step-by-step explanation:
Answer:
there will be about 115 customer
Step-by-step explanation:
the y intercept is 2.5
(0,2.5) (100 ,35)
the slope is (y2-y1)/(x2-x1)
m = (35-2.5)/(100-0)
m= (32.5)/100
m = .325
y = mx+b
y = .325x+2.5
let y =40 for 40 cars in all the spot
40 = .325 x + 2.5
subtract 2.5
37.5 =.325 x
divide by .325
37.5 /.325 = x
115.4 = x
there will be about 115 customer
Answer:
6.66 hours, that is, 6 hours and 40 minutes.
Step-by-step explanation:
If Mike can plow a field in 12 hours, we plows 1/12 of the field each hour.
If Phil can plow a field in 15 hours, we plows 1/15 of the field each hour.
So if they are working together, they can plow (1/12) + (1/15) of the field each hour, that is:
(1/12) + (1/15) = (5 + 4) / 60 = 9 / 60 = 3 / 20 = 1 / 6.66
So if they work together, they can plow the field in 6.66 hours, that is, 6 hours and 40 minutes.
