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tangare [24]
3 years ago
8

A student determined the value of x as shown. Explain the students error. (Click on photo and NO ABSOLUTELY NO LINKS)

Mathematics
1 answer:
postnew [5]3 years ago
5 0

Answer:

Answer is in the link below- jkjk

Step-by-step explanation:

It's a right angle so it can only add to 90 degrees, not 180

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Sedaia [141]

Answer:

The amount of steel used = 94.38 m^{2}

Step-by-step explanation:

Height of the tank = 4.5 m.

Diameter of the tank = 4.2 m.

But,

radius = \frac{diameter}{2}

           = \frac{4.2}{2}

radius  = 2.1 m

Total surface area of a cylinder = 2\pirh + 2\pir^{2}

                                      = 2\pir(r + h)

                                      = 2 x \frac{22}{7} x 2.1 (2.1 + 4.5)

                                      = 44 x 0.3 (6.6)

                                      = 87.12

Total surface area of a cylinder = 87.12 m^{2}

Since \frac{1}{12} of the steel was wasted, then;

\frac{1}{12} x 87.12 = 7.26 m^{2}

Actual area of steel sheet used = 87.12 + 7.26

                                                     = 94.38 m^{2}

Thus, 94.38 m^{2} of steel was used in making the tank.

4 0
3 years ago
Which expression is equivalent to the one below? 6 ÷ 5<br><br>A 6:1/5<br>B 5:1/6<br>C 5/6<br>D 30​
vlada-n [284]

Answer:

option A

Step-by-step explanation:

6:1/5 can also be written as 6/1÷5 which equals to 6÷5

7 0
3 years ago
Read 2 more answers
Simplify 5(a - <br> b. 6(a <br> b. - 7(a - 2b)
Elan Coil [88]
Not sure what you're asking. are you wanting to solve 5 ( a - b), where b equals those two things listed below? If that's the case, I can definitely help. If not, please clarify.
6 0
3 years ago
Identify the following for h(x) = (x - 2)2 - 3
xz_007 [3.2K]

Answer:

bbbbbbb

Step-by-step explanation:

i hope this helps

3 0
3 years ago
The length of a rectangle is one more that three times its width. If the perimeter is 42 inches, find the dimensions of the rect
Liono4ka [1.6K]
Let w=width
L= length
3w+1=l
Perimeter -2(l+w)
2(W+3w+1)=42
Divide both sides by 2
W+3w+1=21
Subtract 1
W+3w=20
Add like terms
4w=20
Divide both sides by 4
W=5
The width is 5 inches

3w+1=l
Input the width into the equation
3(5)+1=l
15+1=l
16=l
The length of the rectangle is 16 inches

The rectangle is 5 x 16 inches
6 0
3 years ago
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