Can you please check my answers? Thanxs!
Write an equation that expresses the relationship. Use k as the constant of variation.
20. f varies jointly as b and the square of c.
I got: f=kbc^2
22. r varies jointly as the square of s and the square of t.
I got: r=ks^2t^2
Find the variation equation for the variation statement.
31. z varies jointly as y and the cube of x; z=96 when x=2 and y=6 (I don't understand this one. My answer choices are: a.y=2x^3y,b.y=2xy^3, c.y=2x^3y, or d. y=2xy^3)
Determine the constant of variation for the stated condition.
40. z varies jointly as x and y, and z=84 when x=28 and y=12.
I got: z=xy, 84=k*22*12, 84=336k, I divided both sides by 336 and I got k=84/336, but it can be reduced, so k=1/4
Solve the problem.
46. h varies jointly as f and g. Find h when f=27, g=12, and k=3.
I got: h=kfg, h=3*27*12, h=972
Write an equation that expresses the relationship. Use k for the constant of proportinality.
50. p varies directly as r and inversely as s.
I got: p=kr/s
53. r varies directly as s and inversely as the square of t.
I got: r=ks/t^2
Determine the constant of variation for the stated condition.
58. z varies directly as x and inversely as y, and z=2 when x=30 and y=60.
I got: z=kx/y, 2=k*30/60, I multiplied each side by 60, and got 120=30k, I divided each side by 30, and got k=120/30, it reduces to k=4
60. z varies directly as x and inversely as y, and z=4 when x=77 and y=28.
I got:z=kx/y, 4=k*77/25, I multiplied each side by 25 and got 112=77k, I divided both sides by 77, and got k=16/11.
Solve the problem.
66. y varies jointly as a and b inversely as the square root of c, y=24 when a=6,b=4, and c=49. Find y when a=2, b=5, and c=16.
I got: y=kab/ sqrt of c, y=2*5/ sqrt of 16, y=10/4, which reduces to y=2.5
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2 answers

they are all right! Good job
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Straight A Student 
If y is directly proportional to x3 and y = 17 when x = 7, find y if x = 5. (Round off your answer to the nearest hundredth.)
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