The radius of a circular disk is given as 25 cm with a maximal error in measurement of 0.3 cm. use differentials to estimate the following. (a) the maximum error in the calculated area of the disk. (b) the relative maximum error. (c) the percentage error in that case.

Answer with Step-by-step explanation:

We are given  that

Radius of circular disk=r=25 cm

Maximal error in measurement of radius =0.3

We know that

Surface area of circle =A=

Differentiate w.r.t r

a.Maximum error=

Substitute the values then we get

Hence, the maximum error in area of disk=

b.

Relative error in A:

Substitute the value in the formula

Then ,we get

Relative maximal error in area of disk=

Hence, the relative maximum error in area  of disk=0.024

c.Relative error  percentage in area of disk=

Substitute the values then we get

Relative error  percentage in area of disk=%

Hence, the percentage error in area of disk=2.4%

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step-by-step explanation:

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c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)