Which situation is best modeled with a division expression? a-finding the number of equal-sized parts into which a number can be split b-finding the combined value of several different numbers c-finding the distance between two numbers on a number line d-finding the total value when several of the same number are grouped together AND Joylin’s work to solve a math problem is shown below. Problem: Manny walked 5/16 of the distance to the library in 1/3 of an hour. If he walks at a constant rate, what is the total amount of time he will spend walking to the library? What was Joylin’s first error? a-She switched the divisor and the dividend when creating an equation to model the problem in step 1. b-She replaced both the divisor and the dividend with their reciprocals when changing division to multiplication in step 2. c-She multiplied the two numerators and the two denominators to generate her product in step 3. d-She reduced the improper fraction incorrectly when getting her final answer.

answer: ratio of volume of cone (with 3 times the height and equal diameter) to volume of cylinder is 2 to 1. the value of π is not used.

step-by-step explanation:

radius is diameter/2 = 4.

area of circle is π r^2.

volume of cylinder is height × area of base = hπr^2 = 3(4^2) π = 48π cubic inches.

not knowing the formula for volume of cone, i calculate it using calculus (which is for calculating things).

volume of cone is integral 0 to h area(y) dy. area(y) is π r(y)^2. r(y) runs r to zero as y runs zero to h, r(0) = r, r(h) = 0.

r(y) = r - r/h y

area(y) = π (r - r/h y)^2 = π (r^2 - 2r^2y/h + r^2y^2/h^2) = π r^2(1-2y/h+y^2/h^2)

antiderivative area(y) = π r^2 (y-y^2/h+y^3/(3h^2))

integral 0 to h = π r^2(h-h^2/h+h^3/(3h^2) - (0)) = π r^2(h - h + h/3) = π r^2(h/3) = π/3 r^2 h

volume of this cone is π/3(4^2)18 cubic inches.

= 6 16 π = 96π cubic inches.

cone has twice the volume, 96/48.

cone height is 6 times the cylinder.

ratio of volume formula: π r^2 cancels.

cone over cylinder ratio is 6h/3 to h, 2 to 1.

853.3

step-by-step explanation:

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