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2 years ago

Can someone please solve

Mathematics

1 answer:

pentagon [3]2 years ago

7 0

Answer:

Step-by-step explanation:

Evaluate 6 (2 x^2 - 5) where x = -3:

6 (2 x^2 - 5) = 6 (2×(-3)^2 - 5)

Hint: | Evaluate (-3)^2.

(-3)^2 = 9:

6 (2×9 - 5)

Hint: | Multiply 2 and 9 together.

2×9 = 18:

6 (18 - 5)

Hint: | Subtract 5 from 18.

| 1 | 8

- | | 5

| 1 | 3:

6×13

Hint: | Multiply 6 and 13 together.

6×13 = 78:

Answer: 78

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A solid toy is in the form of a hemisphere surmounted by a right circular cone. The height of the cone is 4 cm and diameter of t

docker41 [41]

Answer:

See below ~

Step-by-step explanation:

Things to Find

Volume of Toy
Difference of Volumes in Cube and Toy
Total Surface of Toy

Volume of Toy

Volume of Hemisphere + Volume (Cone)
2/3πr³ + 1/3πr²h
1/3πr² (2r + h)
1/3 x 3.14 x 16 (8 + 4)
1/3 x 50.24 x 12
50.24 x 4
200.96 cm³

Volume of Circumscribing Cube

Edge length is same as diameter
V = (8)³
V = 512 cm³

Difference in Volume

512 - 200.96
311.04 cm³

Slant height of cone

l² = 4² + 4²
l² = 32
l = 4√2 cm = 5.6 cm

Surface Area of Toy

CSA (hemisphere) + CSA (Cone)
2πr² + πrl
πr (2r + l)
3.14 x 4 (8 + 5.6)
12.56 x 13.6
170.8 cm²

3 0

2 years ago

PLEASE HELP :)

mash [69]

The best answer I believe is C

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3 years ago

Solve 2∕3 + 5∕6 and put answer in simplest form. A. 3∕2 B. 2∕3 C. 9∕6 D. 7∕6

kaheart [24]

2/3 + 5/6
= 4/6 + 5/6
= 9/6
= 3/2

A. 3/2

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3 years ago

What is meant by a system of linear equations?

photoshop1234 [79]

It’s a grouping of linear(straight line)equations that deal with the same variables. Hope that helped?

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2 years ago

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3 years ago