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Andrew [12]
3 years ago
8

If x varies directly as y, and x = 7.5 when y = 10, find x when y = 4.

Mathematics
2 answers:
Lilit [14]3 years ago
7 0
The answer is A) 3.
I hope this helps.
Westkost [7]3 years ago
5 0
A.) 3 Because You Need To Find Out What Makes X 7.5 And Y 10 By Dividing It When You Divide 10 By 7.d You Get .75 Then Multiply 4 By .75

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Answer:

Area =  a^4+2a^3+8a^2+6a+15

Step-by-step explanation:

The area of a rectangle is given by:

Area = Height * Width

The expressions for height and width are given. We just need to multiply and add like terms (if applicable) to find the expression for the area of the rectangle.

Remember to use distributive property:

(a+b)(x+y) = ax + ay + bx + by

Thus, we have:

(a^2+3)(a^2+2a+5)\\=(a^2)(a^2)+(a^2)(2a)+(a^2)(5)+3a^2+6a+15\\=a^4+2a^3+5a^2+3a^2+6a+15\\=a^4+2a^3+8a^2+6a+15

THis is the expression for area.

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3 years ago
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