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n200080 [17]
3 years ago
11

I need help on this problem plz I need help

Mathematics
1 answer:
Annette [7]3 years ago
4 0

Answer:

The number is 35

Step-by-step explanation:

Let x be the number

1/5 x + 3x

=

2x + 42                 Break the question into phrases and solve 1 phrase at a time.

1/5 = 0.2

0.2x + 3x = 2x + 42              Combine the left

3.2x = 2x + 42                       Subtract 2x from both sides

3.2x - 2x = 42                        Combine

1.2x = 42                                Divide by 1.2

x = 42/1.2

x = 35

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Answer:

x = 26

Step-by-step explanation:

it is a right angle so

(x+4)3=90

3x+12=90

-12         -12

3x = 90-12

3x = 78

/3       /3

x = 26

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3 years ago
Find the indicated quotient to the nearest tenth
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I give 20! Find the surface area. And without explanation please, I don’t have enough time.
oee [108]

Answer:

816 cm²

Step-by-step explanation:

Surface area of the composite figure = (surface area of the larger rectangular prism + surface area of the smaller rectangular prism) - area of the side of the smaller rectangular prism that is joined to the bigger prism.

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✔️surface area of the smaller rectangular prism:

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✔️area of the side of the smaller rectangular prism that is joined to the bigger prism.

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5y^2+5−4−4y^2+5y^2−4x^3 −1
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Answer:

\boxed{ \bold{ \huge{ \boxed{ \sf{4 {x}^{3}  + 6 {y}^{2} }}}}}

Step-by-step explanation:

\sf{5 {y }^{2}  + 5 - 4 - 4 {y}^{2}  + 5 {y}^{2}  - 4 {x}^{3}  - 1}

Collect like terms

⇒\sf{ 4 {x}^{3}  + 5 {y}^{2}  - 4 {y}^{2}  + 5 {y}^{2}  + 5 - 4 - 1}

⇒\sf{4 {x}^{3}  +  {y}^{2}  + 5 {y}^{2}  + 5 - 4 - 1}

⇒\sf{4 {x}^{3}  + 6 {y}^{2}  + 5 - 4 - 1}

Calculate

⇒\sf{4 {x}^{3}  + 6 {y}^{2}  + 1 - 1}

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Hope I helped!

Best regards! :D

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