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sineoko [7]
3 years ago
10

1 consider the surface area of the pyramid shown

Mathematics
1 answer:
lesya [120]3 years ago
4 0
1A. A = 1/2bh
1/2 x 4 x 3.46
A = 6.92 square ft

1B. A = bh
4 x 6
A = 24 square feet

1C. 24 + 6.92 = 30.92 square feet

The surface area of those 2 pieces is 30.92 square feet.

2A. SA = (6.92 x 2) + (24x3)
13.84 + 72
SA = 85.84 Square feet
It would take 85.84 square feet if fabric to make the tent.

3A. V = lwh
1/2 x 2 x 7/2
7/2 cubic inches

You can fit 3 1/2 cubes with side lengths of 1 in because each cube would be 1 cubic inch.

3B. The volume of a cube with edges that are 1/2 in. would be 1/2/ x 1/2 x 1/2 = 1/8 cubic inch.

You would divide 7/2 into groups of 1/8 by multiplying 7/2 by the reciprocal of 1/8.

7/2 x 8/1 = 28 cubes.
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Approximate the change in the volume of a sphere when its radius changes from r = 30 ft to r=10.1 ft [v(r)=4/3Ï€r^3]. When r cha
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Answer: ∆V for r = 10.1 to 10ft

∆V = 40πft^3 = 125.7ft^3

Approximate the change in the volume of a sphere When r changes from 10 ft to 10.1 ft, ΔV=_________

[v(r)=4/3Ï€r^3].

Step-by-step explanation:

Volume of a sphere is given by;

V = 4/3πr^3

Where r is the radius.

Change in Volume with respect to change in radius of a sphere is given by;

dV/dr = 4πr^2

V'(r) = 4πr^2

V'(10) = 400π

V'(10.1) - V'(10) ~= 0.1(400π) = 40π

Therefore change in Volume from r = 10 to 10.1 is

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Of by direct substitution

∆V = 4/3π(R^3 - r^3)

Where R = 10.1ft and r = 10ft

∆V = 4/3π(10.1^3 - 10^3)

∆V = 40.4π ~= 40πft^3

And for R = 30ft to r = 10.1ft

∆V = 4/3π(30^3 - 10.1^3)

∆V = 34626.3πft^3

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