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Mathematics

1 answer:

PtichkaEL [24]3 years ago

5 0

Answer:

The answer is B

Step-by-step explanation:

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A cylinder has a base diameter of 4 inches and a height of 4 inches. What is its volume in cubic inches, to the nearest tenths p

ryzh [129]

Answer:

V=πr2h=π·22·4≈50.26548

Step-by-step explanation:

the first step is to get a radius that is 1/2 of diameter. So 4/2=2, r=2

then pi x 2^2 x 4 which gets you 50.265 or 20.27 if you round it

3 0

3 years ago

Explain two different strategies that you could use to determine the equation of the axis of symmetry defined by y = -2x2 + 16x

Lynna [10]

Two Strategies

1. Make use of the formula for the axis of symmetry for ax²+bx+c, which tells you that line is ...

... x = -b/(2a)

... x = -16/(2·(-2))

... x = 4

2. Let a graphing calculator show you the vertex, from which the axis of symmetry is easily determined. (See the attachment.) The graph shows the line of symmetry is x = 4.

My Preference

My preference is for the graphing calculator solution (for problems with integer solutions). The one shown is quick and easy and involves no arithmetic. If the coefficients of the equation are not integers, then the formula version is preferred for an exact solution.

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Comment on vertex form

When you put the equation into vertex form, you find a constant for the location of the vertex that is essentially equivalent to -b/(2a). Doing that generally involves three steps: finding b/a, then dividing that in half to get b/(2a), then realizing that the actual vertex location is at the x-value that is the opposite of the one in the vertex-form equation, so is -b/(2a).