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nordsb [41]
3 years ago
14

Help Help Help ....... please answer this question fast fast......

Mathematics
2 answers:
ICE Princess25 [194]3 years ago
7 0

Answer:

5 m

Step-by-step explanation:

The volume (V) of a square based pyramid is

V = \frac{1}{3} Ah ( A is the area of base and h the height ), thus

\frac{1}{3} A × 12 = 100, that is

4A = 100 ( divide both sides by 4 )

A = 25

Hence s² = 25 ← s is the side of square base

Take the square root of both sides

s = \sqrt{25} = 5

Elan Coil [88]3 years ago
3 0

V = Ab·h : 3

100m³ = Ab·12m : 3

300m³ = Ab·12m

Ab = 300m³/12m

= 25m²

Ab = 25m² = L²

L = √25m²

L = 5m

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AleksandrR [38]

Bob need to paint 205 square feet.

Solution:

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The given image is a trapezoid.

Top base = 12 ft

Bottom base = 20 ft

Area of the trapezoid = \frac{1}{2} \times\text{sum of the parallel sides}\times\text{height}

                                    $=\frac{1}{2}\times(12+20)}\times15

                                    $=\frac{1}{2}\times 32\times15

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Area of the trapezoid =  240 ft²

Surface area to paint = Area of the trapezoid – Area of the door

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                                    = 205 ft²

Hence Bob need to paint 205 square feet.

6 0
3 years ago
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