Answer:
C. 2A/b
Step-by-step explanation:
A = 1/2 b*h
multiply both sides by 2
2A = 2* 1/2 bh
2A = bh
divide by b
2A/b = bh/b
2A/b=h
110*(3*3)
Step-by-step explanation:
=990
Just use PEMDAS
Hello!
The ratio of 1:5
The ratio we are find is 3 : x
We have to find what happened between the ratios
To do this you divide the new number by the old one
3 / 1 = 3
They multiplied the scale by 3 to get the actual wall
Use this to get the length of the wall
3 * 5 = 15
The answer is 15 inches or 1ft 3in
Hope this helps!
Alrighty
squaer base so length=width, nice
v=lwh
but in this case, l=w, so replace l with w
V=w²h
and volume is 32000
32000=w²h
the amount of materials is the surface area
note that there is no top
so
SA=LW+2H(L+W)
L=W so
SA=W²+2H(2W)
SA=W²+4HW
alrighty
we gots
SA=W²+4HW and
32000=W²H
we want to minimize the square foottage
get rid of one of the variables
32000=W²H
solve for H
32000/W²=H
subsitute
SA=W²+4WH
SA=W²+4W(32000/W²)
SA=W²+128000/W
take derivitive to find the minimum
dSA/dW=2W-128000/W²
where does it equal 0?
0=2W-1280000/W²
128000/W²=2W
128000=2W³
64000=W³
40=W
so sub back
32000/W²=H
32000/(40)²=H
32000/(1600)=H
20=H
the box is 20cm height and the width and length are 40cm