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qwelly [4]
3 years ago
8

The ratio of the heights of two similar pyramids is 4:7. The volume of the smaller pyramid is 1,331 cm3. To the nearest whole nu

mber, what is the volume of the larger pyramid
Mathematics
1 answer:
Andrej [43]3 years ago
6 0
Volume ratio 4^3/7^3 = 64/34364/343 = 1331/X cross multiply and solve for X
So the answer will be <span> 7,133cm3 </span>
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5.) Simplify the following polynomial. -6x3+5x-3-(2x3+4x2-3x+1)
Vera_Pavlovna [14]

Answer:

-8x3 - 4x2 + 8x - 4

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
A cylinder has a radius of 8 meters and a height of 4 meters. .
Novay_Z [31]
<h2><u>Solution</u> :-</h2>

Given : Radius of cylinder = 8 m

Height = 4 m

Volume of cylinder = πr²h cu. units

= 22/7 × 8 × 8 × 4 m³

= 804.57 m³ (approx.)

Curved surface area = 2πrh sq. units

= 2 × 22/7 × 8 × 4 m²

= 201.14 m² (approx.)

Total surface area = 2πr(r + h) sq. units

= 2 × 22/7 × 8 (8 + 4) m²

= 2 × 22/7 × 8 × 12 m²

= 603.43 (approx.)

4 0
3 years ago
I’m not sure on how to do this so could you show me step by step?
likoan [24]

Answer:

yes

Step-by-step explanation:

So the circumfrehce of a circle is basically the perimiter of the circle. Let me help with number 1. We need to find the radius. In order to do tuis we divide 6 in half giving us 3. Then we plug in 3 into the circumfrence formula (Pi times the radius multiplied by 2). So it would be 3.14*3*2. The answer for number 1 is 18.85

5 0
3 years ago
A train travels 80 miles per hour. If its speed remains the same, how far will the train have gone in 90 minutes?
Nataly_w [17]
Hello! So, the train travels 80 miles in an hour. 90 minutes is equivalent ot 1 ½ hours. In case you don't know, ½ of 80 is 40. To find the distance gone in 90 minutes, we can just add 80 and 40. 80 + 40 is 120. Another way to solve it is to multiply 80 by 1.5 and you would still get the same answer. There. The train will have gone 120 miles in 90 minutes.
3 0
3 years ago
Can someone please help me?? Im not quite sure how to get this answer.
nekit [7.7K]

Answer:

C. 54π + 20.25√3 cm²

Step-by-step explanation:

The shaded area can be split into two areas: a sector and an isosceles triangle.

Area of a sector is:

A = (θ/360°) πr²

where θ is the central angle and r is the radius.

Area of an isosceles triangle can be found with SAS formula:

A = ½ ab sin θ

where a and b are two sides of a triangle and θ is the angle between them.

In this case, r = a = b = 9 cm.  The central angle of the sector is 240°, and the vertex angle of the triangle is 120°.  Therefore, the total area is:

A = (240°/360°) π (9 cm)² + ½ (9 cm) (9 cm) sin 120°

A = 54π + 20.25√3 cm²

5 0
3 years ago
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