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pishuonlain [190]
3 years ago
8

I don't undestand how to solve this problem

Mathematics
1 answer:
satela [25.4K]3 years ago
4 0

Answer:

Volume = 20

Step-by-step explanation:

To find volume of the shape you split the shape into two shapes: A triangle or pyramid and a rectangle

The volujme of a rectangle is W x L x H

A = 2 x 5 x 8

A = 80

The volume of a pyramid is

A = \frac{1}{2}Bh    The B is the area of the base so B = L x W = 5 x 2 = 10 so B = 10

A = \frac{1}{2} 10 x 4

A = \frac{1}{2} 40

A = 20

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What equation can you write to solve for x?
KengaRu [80]

Answer:

(3x) ° + (x+ 10)° = 90°

Step-by-step explanation:

(3x) ° + (x+ 10)° = 90°

3x + x + 10 = 90

4x = 90 - 10

4x = 80

x = 20

(3x) ° = 3 x 20 = 60°

(x + 10)° = 20 + 10 = 30°

4 0
3 years ago
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What are the dimensions of a rectangle with an area of 12 square cm and a perimeter of 14 cm?
kow [346]

Answer:

For the rectangle

Length=ℓ

Breadth=b

Area is 12 cm2

ℓb=12

Perimeter is 16 cm

2(ℓ+b)=16

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Substitute b=12ℓ from first equation

ℓ+12ℓ=8

ℓ2+12=8ℓ

ℓ2−8ℓ+12=0

Use quadratic formula (x=−b±√b2−4ac2a) to find ℓ

ℓ=−(−8)±√(−8)2−(4×1×12)2×1

ℓ=8±√162

ℓ=8±42

ℓ1=8+42=6

ℓ2=8−42

Step-by-step explanation:

For the rectangle

Length=ℓ

Breadth=b

Area is 12 cm2

ℓb=12

Perimeter is 16 cm

2(ℓ+b)=16

ℓ+b=8

Substitute b=12ℓ from first equation

ℓ+12ℓ=8

ℓ2+12=8ℓ

ℓ2−8ℓ+12=0

Use quadratic formula (x=−b±√b2−4ac2a) to find ℓ

ℓ=−(−8)±√(−8)2−(4×1×12)2×1

ℓ=8±√162

ℓ=8±42

ℓ1=8+42=6

ℓ2=8−42

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3 years ago
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Create a word problem with the equation x=y^3
ivann1987 [24]

Step-by-step explanation:

The sum of two positive numbers is four and three times the smaller number is one more than the larger. What are the two numbers?

Explanation:

To find such a word problem, we can first note that

1.25

+

2.75

=

4

, which makes a nice easy number to refer to verbally.

In addition, note that

3

⋅

1.25

=

3.75

=

2.75

+

1

, which allows us to formulate the second part of the system.

So we can pose a question like:

The sum of two positive numbers is four and three times the smaller number is one more than the larger. What are the two numbers?

How would you solve it?

Let

x

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y

represent the smaller and larger numbers respectively.

Then from the question:

{

x

+

y

=

4

3

x

=

y

+

1

Subtracting

y

from both sides of the second equation gives us:

3

x

−

y

=

1

Adding this to the first equation gives us:

4

x

=

5

Then dividing both sides by

4

gives us:

x

=

5

4

=

1.25

Subtracting

x

from both sides of the first equation, we have:

y

=

4

−

x

=

4

−

1.25

=

2.75

5 0
3 years ago
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