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3 years ago

1) In a class of 30 children, 60% of the

Mathematics

2 answers:

Irina-Kira [14]3 years ago

5 0

There are 18 girls in that class

Tpy6a [65]3 years ago

4 0

Answer:

18 students in the class are girls

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likoan [24]

Total is 61.36 not sure how much she should leave for tip

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2 years ago

Check each relation below that is a direct variation.

guapka [62]

Answer: option A and option D

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2 years ago

Find the volume of the cone. Use 3.14 for π. Round to the nearest tenth.

Leviafan [203]

$Volume\,\,of\,\,cone=1527.1\,\,cm^3$

So, Option C is correct.

Step-by-step explanation:

We need to find Volume of cone.

We are given:

π = 3.14

Length = 27 cm

Diameter = 15 cm

The formula used to find Volume of cone is:

$Volume\,\,of\,\,cone=\frac{1}{3}\pi r^2h$

We are given diameter but we need radius in the formula

So, Radius = Diameter/2 = 15/2 = 7.5 cm

We need to find height of cone.

Using Pythagoras theorem:

$h^2=p^2+b^2\\ (27)^2=p^2+(7.5)^2\\729=p^2+56.25\\p^2=729-56.25\\p^2=672.75\\Taking\,\,square\,\,root:\\p=25.93$

So, Height of cone = p= 25.93

So, r= 7.5 and h= 25.93 and π = 3.14

Putting values in the formula:

$Volume\,\,of\,\,cone=\frac{1}{3}3.14*(7.5)^2*25.93$

$Volume\,\,of\,\,cone=1526.62$

Rounding off to the nearest tenth:

$Volume\,\,of\,\,cone=1527.1\,\,cm^3$

So, Option C is correct.

Keywords: Volume of cone.

Learn more about Volume of cone at:

#learnwithBrainly

6 0

3 years ago

The perimeter of a rectangle is (10x2).if it's width is (2x-1),which expression represents the length

alexandr402 [8]

Answer: b. 3x + 2

Step-by-step explanation:

2l + 2w = p

2l + 2(2x - 1) = 10x + 2

2l + 4x - 2 = 10x + 2

2l = 6x + 4

l = 3x + 2

4 0

3 years ago

Find the unit rate. <br> 247 heartbeats in 612 minutes

ollegr [7]

Answer:

247/612 bpm

Step-by-step explanation:

247 beats / 612 minutes

beats / minute

beats per minute = bpm

5 0

2 years ago