Answer:
i can't see the rest of the question so i don't know the answer choices but:
since x≥8
whichever choice is less than 8 is incorrect
step-by-step explanation:
i can't see the rest of the question so i don't know the answer choices but:
7x≥56
x≥8
Answer:
7m + 29
Step-by-step explanation:
You add 2m and 5m to get 7m
Then add -16 and 45 to get 29
Divide each side of the equation by 18. Then it will say 'm = a fraction'.
That's the solution. You can reduce (simplify) the fraction to make it look
neater.
Answer:
20- max volume dimension
Step-by-step explanation:
since we don't know the amount of cardboard cut off, we'll take it as "x"^^
so the bottom of the box have dimensions of 40-2x(since squares are cut from both corners in a side) by 40-2x hence we can take area of base as
(40-2x)^2
since v=base*height
lets take height as x
x(40-2x) (40-2x)=v
(40x-2x^2)(40-2x)=v
4x^3-160x^2+1600x=v
take the derivitive: 12x^2-320x+1600
factor:
4(3x^2-80x +400)=0
4(3x-20)(x-20)=0
12x-80=0
x-20=0
x=20, 6.667(reduced from 6.66666666667)
