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3 years ago

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Mathematics

1 answer:

tankabanditka [31]3 years ago

4 0

Answer:

Area of circle: 1662.57 cm

Circumference of circle: 144.57 cm

Step-by-step explanation:

Formula of area of circle:

pi x r2 or radius x radius

So, it's 22/7 x 23 x 23 = 1662.571429

Formula of circumference of circle:

2 x pi x radius OR

pi x diameter

Let's use the second method, to find diameter it is radius x 2 = 46

So,

46 x 22/7 = 144.5714286

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If 15% of a number is 30 and 40% of the same number is 80, find 25% of that number.

zepelin [54]

Answer:

Step-by-step explanation:

let the number be x

15% of x= 0.15x

0.15x=30

(divide both sides by 0.15)

x= 200

25% of 200 = 25/100 *200

= 50

5 0

3 years ago

A sawdust pile has a base diameter of 35 feet when it’s height is 30 feet, find the volume of the pile when it is at 50 feet tal

ladessa [460]

Answer:

The volume of the sawdust pile is 16041.7 feet.

Step-by-step explanation:

The sawdust pile formed is in the form of a cone.

The volume of a cone is:

$V=\frac{1}{3}\ \pi r^{2}\ h$

The information provided is:

r = radius of the base = diameter ÷ 2 = (35 ÷ 2) feet

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Compute the volume of the sawdust pile as follows:

$V=\frac{1}{3}\ \pi r^{2}\ h$

$=\frac{1}{3}\times \frac{22}{7}\times (\frac{35}{2})^{2}\times 50\\\\=16041.6667\\\\\approx 16041.7\ \text{feet}$

Thus, the volume of the sawdust pile is 16041.7 feet.

7 0

3 years ago

Solve the simultaneous equations 7 x + 4 y = 26 5 x + 4 y = 14

fiasKO [112]

Step-by-step explanation:

i used elimination method

8 0

3 years ago

Lynn has a box of crayons.

Scrat [10]

Answer:

There are 72 crayons in the box

Step-by-step explanation:

Fractions

To solve this problem we'll manage numbers as fractions to keep the precision up to the end of it.

Lynn has a box of crayons. It's given 4/9 of the crayons are blue. The remaining crayons are:

$1-\frac{4}{9}=\frac{5}{9}$

From that portion, 65% are red, or equivalently, 35% are yellow.

We write 35% as a fraction:

$\displaystyle 35\%=\frac{35}{100}=\frac{7}{20}$

Thus, the portion of yellow crayons is:

$\displaystyle \frac{7}{20}\cdot \frac{5}{9}=\frac{7}{36}$

This fraction of x crayons is equal to 14, thus:

$\displaystyle x=\frac{14}{\frac{7}{36}}=14\cdot\frac{36}{7}$

x = 72

There are 72 crayons in the box

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3 years ago

;)

mafiozo [28]

Answer:

Side to side

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And streets

3 0

3 years ago

Read 2 more answers