-5m +3m=
HELP ASAP, I WILL GIVE BRAINLIEST TO FIRST CORRECT ANSWER

-2m is the answer because with -5 adding +3 ( positives don't have to have a sign) it would be like 5-3 but then add the biggest sign which would be the negative sign in this case then you would get -2m. So -5m +3m = -2m.

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2

an altitude of 15,000 feet

step-by-step explanation: