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2 years ago

Math Review 7th Grade. 2 Parts

Mathematics

2 answers:

miv72 [106K]2 years ago

8 0

Here is the answer Ik 7th grade can be hard sometimes

Lisa [10]2 years ago

6 0

Answer:use a cac

Step-by-step explanation:i would do that but I’m verry busy so I would use a cac

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What is 3/4 times 2/4

Sonja [21]

Answer:

6/16, which can be reduced to 3/8

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3 years ago

I am really confused with this question.

klemol [59]

It would be A or B
but not D,C

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2 years ago

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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 $\pi$ rh + 2 $\pi$ $r^{2}$

= 2 $\pi$ r(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.

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3 years ago

a plastering contractor charges $18 per square yard( that is $2 per square foot). what is the cost of plastering 100 feet of wal

Tomtit [17]

Basically, this problem is going to require you to solve for the area and multiply it with the given cost unit.

Area = Length*Height
Area = 100 ft * 8 ft = 800 ft²

Total Cost = (Unit Cost)(Area)
Total Cost = ($2/ft²)(800 ft²)
<em>Total Cost = $1,600</em>

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3 years ago

There are 4 triangles and 2 circles. What is the simplest ratio of circles to triangles?

Nat2105 [25]

Answer:1:2

Step-by-step explanation:

it is this answer because you have 2 circles for 4 triangles, you can simplify that by dividing each number by 2 and you get 1 and 2

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3 years ago

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