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2 years ago

What multiplication expression represents 7+7+7+7?

Mathematics

2 answers:

ra1l [238]2 years ago

7 0

7times 4 = 28 ggggggggggggggg

scoray [572]2 years ago

6 0

7*4 since there are 4 7's

And the answer would be 28

hope this helped!

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A bicycle training wheel has a radius of 3 inches. The bicycle wheel has a radius of 10 inches. Approximately how much smaller,

zhuklara [117]

Answer:

$285.74\text{ inch}^2$

Step-by-step explanation:

GIVEN: A bicycle training wheel has a radius of $3\text{ inch}$ . The bicycle wheel has a radius of $10\text{ inch}$ .

TO FIND: Approximately how much smaller, in square inches, is the area of the training wheel than the area of the regular wheel.

SOLUTION:

radius of bicycle wheel $=10\text{ inch}$

area of bicycle wheel $=\pi r^2$

putting value,

area of bicycle wheel $=3.14\times10^2$

$=314\text{ inch}^2$

radius of bicycle training wheel $=3\text{ inch}$

area of bicycle training wheel $=\pi r^2$

putting value,

area of bicycle wheel $=3.14\times3^2$

$=28.26\text{ inch}^2$

difference in area of bicycle wheel and bicycle training wheel

$=\text{area of bicycle wheel}-\text{area of bicycle training wheel}$

$=314-28.26$

$=285.74\text{ inch}^2$

hence the training wheel is $285.74\text{ inch}^2$ smaller than regular wheel

4 0

2 years ago

A bookseller bought 80 books at rs 30 each 20 books were stolen and he sold the remaining books at 5% loss find the selling pric

Blizzard [7]

Answer:

rs 38.

Step-by-step explanation:

Total cost of the 80 books = 80*30 = rs 2400.

He had 60 books to sell and made a 5% loss.

Thus his income from these books was 2400 - 0.05*2400 = rs 2280.

So the selling price of each book was 2280 / 60 = rs 38.

8 0

2 years ago

What is the measure of angle x?

QveST [7]

It is b I think if it’s wrong sorry

3 0

2 years ago

The difference between two rational numbers and get a negative number

expeople1 [14]

2-3 is -1. difference between two rational numbers that make a negative

4 0

2 years ago

The sun shines at a 30° angle to the ground. To the nearest inch, how long is the shadow cast by a 72-inch tall fence post?

Mars2501 [29]

Answer:

The shadow length is 125 inches.

Step-by-step explanation:

The triangle that the sun's rays and the fence post form is shown in the figure.

From trigonometry we know that $tan(30^o)$ is the ratio of the opposite (72-in fence) to the adjacent side $L$ of the triangle (the shadow length):

$tan(30^o) = \dfrac{72 in}{L}$

since

$tan(30^o) = \dfrac{\sqrt{3} }{3}$

we have

$\dfrac{\sqrt{3} }{3} = \dfrac{72 in}{L}$

solving for $L$ we get:

$L = 72\sqrt{3}\\\\\boxed{L = 124.71\: in.}$

Hence, the length of the shadow to the nearest inch is 125 inches.

7 0

2 years ago