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JulijaS [17]
3 years ago
6

Twice a number plus 6 times the number is 72

Mathematics
2 answers:
kolbaska11 [484]3 years ago
8 0

(2 \times x) + (6 \times x) = 72 \\ 2x + 6x = 72 \\ 8x = 72 \\ x = 72 \div 8 \\  x  = 9

ExtremeBDS [4]3 years ago
6 0

Answer:

9

Step-by-step explanation:

Let the no be x

By the conditions given ,

2x + 6x = 72

8x = 72

x = 72/8

x = 9

therefore the no is 9

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What percent of 130 is 182
Greeley [361]
The answer is 140 percent
6 0
4 years ago
An icicle is in the shape of an inverted cone with a diameter of 9 mm and a height of 27 mm. In cubic millimeters, how much froz
sergey [27]

Answer:

572.56

Step-by-step explanation:

V=π r2h

3=π·4.52·27

3≈572.55526

5 0
3 years ago
Read 2 more answers
4) f(x) = 2x + 8, g(x)=6x + 6<br> Find (f. g)(x).
LiRa [457]
F x G (x)

(2x + 8) x (6x + 6)

12x^2 + 12x + 48x + 48

12x^2 + 60x + 48

x^2 + 5x + 4 (Answer)

Hope this helps
3 0
4 years ago
A rectangular storage container with an open top is to have a volume of 10 m3. The length of this base is twice the width. Mater
marshall27 [118]

Answer:

$ 327.08

Step-by-step explanation:

Let x = width of the container,

Then Length of the container = 2x

Let h = height of the container,

volume of the container can be calculated as length × width × height

= 2x × x × h

= 2x² h

Then we can say Volume =

= 2x² h=10

If we simplify inorder to get h

We have h= 5/x²

Then the area= (2L×h) +(2xh)

Where L is lenght

x= wish

h= height

= 2× 2x × h+ x× h

= 4x× 5/x + 2x × 5/x

Area = 30/x

Now, the area of the base = length × width

But from question, for the base costs $20 per square meter. Material for the sides costs $12 per square meter

Then the cost C(x)= 2x²× 20+30/x ×12

C(x)= 40x²+35/x²

If we differenciate wrt x we have

C(x)= 80-360/x²

If we equate C(x)=0the

80=360/x²

x= 1.651

If substitute to C(x)= 40x²+35/x²

C(x) = 40(1.651)² + 35/(1.651)²

We have cost= 327.08

6 0
3 years ago
What is the approximate value of b, rounded to the nearest tenth?
ozzi

we know that

m∠ZWY=m∠WXY --------> given problem

so

In the right triangle ZWY

tan\ ZWY=\frac{ZY}{YW}=\frac{5}{6}

In the right triangle XWY

tan\ WXY=\frac{WY}{XY}=\frac{6}{a}

\frac{6}{a} =\frac{5}{6} \\ \\5*a=6*6 \\ \\a=\frac{36}{5}=7.2\ units

<u>Find the value of b</u>

<u>Applying the Pythagorean Theorem</u>

In the right triangle XWY

b^{2}=6^{2}+a^{2} \\b^{2}=6^{2}+7.2^{2}\\b^{2}=87.84\\ b= 9.4\ units

therefore

<u>the answer is the option</u>

D) 9.4 units

4 0
3 years ago
Read 2 more answers
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