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Andru [333]
3 years ago
13

What is the surface area of the rectangular pyramid below

Mathematics
2 answers:
Kobotan [32]3 years ago
6 0

S=15\times15+4(7.5\times15)=\boxed{675}

Mademuasel [1]3 years ago
5 0

Answer:

Option C is correct.

Step-by-step explanation:

Given:

Length of the base rectangle = 15 unit

Width of the  base rectangle = 15 unit

Height of triangle on the side of pyramid = 15 unit

Length of the base of the triangle = 15 unit

Surface are of the rectangular pyramid = Area of Base + 4 × Area of triangle on side.

Area of base = length × width = 15 × 15 = 225 unit²

Area of the triangle = 1/2 × base  × height = 1/2 × 15 × 15 = 112.5 unit²

Surface Area = 225 + 4 × 112.5  = 225 + 450 = 675 unit²

Therefore, Option C is correct.

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Step-by-step explanation:

The differential equation of this problem is;

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Where;

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R_out is the rate at which salt exits

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We are given;

Concentration of salt in inflow = 4 lb/gal

Input rate of brine = 3 gal/min

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Due to the fact that solution is pumped out at a slower rate, thus it is accumulating at the rate of (3 - 2)gal/min = 1 gal/min

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R_out = [A(t)/(100 + t)]lb/gal × 2 gal/min

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