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kogti [31]
4 years ago
14

Evaluate each expression.

Mathematics
1 answer:
AfilCa [17]4 years ago
6 0
#1 is 3
#2 is 0
#3 is -2
#4 is 7
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a tower casts a 450 ft shadow at the same time that a 4 ft child casts a 6 ft shadow. Write and solve a proportion to find the h
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Check the picture below.

7 0
3 years ago
If the length of a rectangle is 3 feet less then twice its width and the area is 54square feet what are its dimensions
erma4kov [3.2K]
The length (L) of the rectangle can be written as a function of the width (W)L = 2W - 3:
Now since we know Area = Width*Length, we can write the area as a function of the width:
A = L*W = (2W-3)*W
Distributing the W inside the parentheses we have:
A = 2W^2 - 3W
We know the area is 54 ft^2, so we can rewrite it as:
2W^2 - 3W - 54 = 0
Now solve for W by factoring (or by applying the quadratic formula):
2W^2 - 12W + 9W - 54 = 0
Factor out a common 2W from the first two terms and a 9 from the last two terms:
2W(W-6) + 9(W-6) = 0
Regroup the terms to get our fully factored equation:
(2W + 9)(W-6) = 0
This gives us the roots W = 6 and W = -9/2, but width can't be negative so we have width = 6 ft. Then remember that the length L = 2W - 3, so our length is:
L = 2W - 3 = 2(6) - 3 = 12 - 3 = 9
So now we know that our rectangle is 9 feet long and 6 feet wide.
5 0
4 years ago
Please help me with this
zimovet [89]

Answer:

1. -10x + 9

2. 7/16x + 2

3. 2/3x -2

4. x + 1/3

5. -7x - 2/15

8 0
3 years ago
Read 2 more answers
What is the answer to 2x+3=y
jeka57 [31]

Answer:

2x-y= -3

Step-by-step explanation:

2x=y-3

2x-y= -3

There is an app called photomath and u can take pictures of math problems and get the answer

6 0
3 years ago
Read 2 more answers
90 units needed 8per case
Sever21 [200]
Are you asking how much cases is needed to to reach the 90 units? If yes then 90/8 which would give you 11.25. But since it’s by case then round up to get 12 cases. I think I answered it wrong but
6 0
3 years ago
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