A + b = 147....a = 147 - b
5.85a + 4.40b = 786
5.85(147 - b) + 4.40b = 786
859.95 - 5.85b + 4.40b = 786
-5.85b + 4.40b = 786 - 859.95
- 1.45b = -73.95
b = -73.95 / -1.45
b = 51 <== she used 51 lbs of type B coffee
15 I think 1.25 x 12 = 15
-7 +6 would equal -1
-7 and +6 are different signs so subtract and use the sign of the larger number <span />
Answer:
Step-by-step explanation:
A anything below 5.7
-- At 11 AM, when Mel starts out, Juan has already covered 60 miles.
-- After that, since they're traveling in opposite directions, the distance
between them increases (60 + 50) = 110 miles every hour.
Let's call 'H' the number of hours after 11 AM.
Then the distance between them is
D = 110H + 60
When is this distance 830 miles ? Wouldn't you like to know !
830 = 110H + 60
Subtract 60 from each side:
770 = 110H
Divide each side by 110 :
H = 770 / 110 = 7 .
It happens 7 hours after 11 AM.
That would be <u>6:00 PM</u> .