the length of the base of a rectangular prism is twice the width. the perimeter of the base is 42cm. find the hieght of the prism if the volume is 980 cm^3
a. 14cm
b. 23.3 cm
c. 10 cm
d. 18 cm
ANOTHER QUESTION:
THE area of a rectangle is to be 24 square units. the length and width are to be whole numbers. what dimensions give the greatest perimeter?
a. 8 units by 3 units
b. 12 units by 2 units
c. 6 units by 4 units
d. 24 units by 1 unit
i need to get theese 2 questions answred... can u help? its MULTIPLE CHOICE..?
2007-10-29 5:10 am
回答 (5)
2007-10-29 5:23 am
✔ 最佳答案
If the length of the base of a rectangular prism is twice the width and the perimeter of the base is 42cm , then the dimensions are 14 by 7, which gives a base area of 98. Therefore, the height is 980/98, or 10cm
2007-10-29 1:09 pm
answer 1 - b
base is about 4.5 x 9 = 41 (ish)
4.57 er sumthin
then height is 42 x 23 = 960
number 2 - d
perimiter is greatest 24 + 1 + 24 + 1 = 50
if you use say... C = 6 + 4 + 6 + 4 = 20
base is about 4.5 x 9 = 41 (ish)
4.57 er sumthin
then height is 42 x 23 = 960
number 2 - d
perimiter is greatest 24 + 1 + 24 + 1 = 50
if you use say... C = 6 + 4 + 6 + 4 = 20
2007-10-29 12:33 pm
y=2x 2(x+2x)=42 ,6x=42, x=7, y=2x=2*7=14 ,x*y*h=980, 7*14*h=980, 98*h=980 ,h= 980/98=10 the answer is c for the second question you have x*y=24 and2(x+y)=p for the first equation y=24/x then p= 2(x+24/x)=p find the maximum
the answer is d
the answer is d
2007-10-29 12:25 pm
#2
a=l*w
p=2*l+2*w
a=24units^2
24=l*w
a. p=2*8+2*3
=16+6
=22units
b. p=2*12+2*2
=24+4
=28units
c. p=2*6+2*4
=12+8
=20units
d. p=2* 24+2*1
=48+2
=50units
therefore, tha ans. is letter d
a=l*w
p=2*l+2*w
a=24units^2
24=l*w
a. p=2*8+2*3
=16+6
=22units
b. p=2*12+2*2
=24+4
=28units
c. p=2*6+2*4
=12+8
=20units
d. p=2* 24+2*1
=48+2
=50units
therefore, tha ans. is letter d
2007-10-29 12:18 pm
1. B.
980/42= 23.33333...
2. D.
980/42= 23.33333...
2. D.
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