Answer:
Step-by-step explanation:
What we have is a general equation that says this in words:
Laura's hours + Doug's hours = 250 total hours
Since we don't know either person's number of hours, AND since we can only have 1 unknown in a single equation, we need to write Laura's hours in terms of Doug's, or Doug's hours in terms of Laura's. We are told that Doug spent Laura's hours plus another 40 in the lab, so let's call Laura's hours "x". That makes Doug's hours "x + 40". Now we can write our general equation in terms of x:
x + x + 40 = 250 and
2x = 210 so
x = 105
Since Laura is x, she worked 105 hours in the lab and Doug worked 40 hours beyond what Laura worked. Doug worked 145. As long as those 2 numbers add up to 250, we did the job correctly. 105 + 145 = 250? I believe it does!!
Answer:
We divide it into 3 rectangles:
A rectangle with sides 19mi and 5mi,
a rectangle with sides 1mi and 31mi,
and a rectangle with sides 10mi and 20mi,
so we get 95 + 31 + 200 =
Hope this helps!
Answer:-2.5
Step-by-step explanation:
The slope is -2.5
When you owe money it is a negative because when you earn money you have to pay it back
Answer:
-15
Step-by-step explanation:
When adding together two negatives it works just as it would with positive numbers, just with the negative sign to properly negate it.