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Ne4ueva [31]
4 years ago
5

What is the expanded form of 3x(x+3)^2?

Mathematics
1 answer:
Dominik [7]4 years ago
7 0
We need to expand the square binomial and then multiply:
<span>3x(x + 3)^2
= 3x(x + 3)</span>(x + 3<span>)
= 3x(x^2 + 6x + 9)
= 3x^3 + 18x^2 + 27x</span>
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the tens digit of a two digit number is twice the units digit. The sum of the digits is twelve. Find the original number.
KatRina [158]
X - tens digit
y - units digit

x=2y\\&#10;x+y=12\\\\&#10;2y+y=12\\&#10;3y=12\\&#10;y=4\\\\&#10;x=2\cdot4\\&#10;x=8\\\\&#10;10\cdot8+4=\boxed{84}&#10;
4 0
4 years ago
The length of a rectangle is 4 yd longer than its width.
xenn [34]

Answer:

Area = 77 yd²

Step-by-step explanation:

Width = w

Length = w+4

Perimeter =36

Perimeter = L + L + w + w

36 = w+4+w+4+w+w

4w+8 =36

Subtract 8 from both sides

4w = 36 - 8

4w =28

Divide both sides by 4

W= 28/4

W= 7yd

Therefore length = w+4 = 7+4 = 11 yd

Area = length x width

Area = 11× 7

Area = 77 yd²

I hope this was helpful, please mark as brainliest

4 0
3 years ago
Which expression is equivalent to 30 (one-half x minus 2) + 40 (three-fourths y minus 4)?
leonid [27]

Answer:

The answer's 15 x + 30 y - 220

Step-by-step explanation:

I did the quiz and got it correct :)

3 0
4 years ago
the population of a certain town grew from 486,000 in 1980 to 575,400 in 1990. find the equation for this situation and predict
Monica [59]

Answer:

89,400 was the population in 2016

Step-by-step explanation:

7 0
3 years ago
What is the circumference of <br> 26 cm
IgorC [24]

Answer:530.9

Solution Steps:

Area of a circle in terms of radius:

Area = π . r2 = 3.14 × 132 = 530.9 square cm.

In terms of diameter:

Area = π . (d/2)2 = 3.14 × (26/2)2 = 3.14 × (13)2 = 530.9 square cm.

In terms of circumference:

Area = C2/(4π) = 81.682/4π = 6671.62/(4 × 3.14) = 6671.62/(12.56) = 530.9 square cm.

Note: for simplicity, some results may be rounded to nearest hundredth and π was rounded to 3.14. See formula details below in this page.

A circle of radius = 13 or diameter = 26 or circunference = 81.68 cm has an area of 530.9 square centimeters which is equal to:

5.309E-8 square kilometers (km²)

0.05309 square meters (m²)

1.312E-5 acres (ac)

5.309E-6 hectares (ha)

2.05E-8 square miles (mi²)

0.0635 square yards (yd²)

0.5715 square feet (ft²)

82.29 square inches (in²)

Formulae:

 

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
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