MATHEMATICS MIDDLE SCHOOL

What is the approximate circumference of a semicircle with a radius of 30 centimeters

Answers

Answer 1

Answer:

Approximate circumference of a semicircle with a radius of 30 centimeters is 94.2 centimeter

Solution:

Given semicircle with a radius of 30 centimeters

To find: approximate circumference of a semicircle

To find circumference of semicircle we can divide the circumference of circle by 2

circumference of semicircle = circumference of circle $/$ 2

$\text{ circumference of semicircle} = (2 \pi r)/(2) = \pi r$

Substituting the given radius = 30 cm,

$\text{ circumference of semicircle} = 3.14 * 30 = 94.2$

Thus approximate circumference of a semicircle with a radius of 30 centimeters is 94.2 centimeter

Answer 2

Answer:

Answer:

94.2

Step-by-step explanation:

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Evaluate −6 − (−2)

A. -4
B. -8
C. 4
D. 12

Answers

The correct answer is A. -4.

When you subtract a negative, it is the same as adding a positive (the two negative signs cancel each other out). Therefore, we have:

-6 + 2 = -4

A. -4. when you subtract a negative you are actually adding so you would add 2 to -6 and end up with -4

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

Answers

7*4 since there are 4 7's

And the answer would be 28

hope this helped!

7times 4 = 28 ggggggggggggggg

Karin wants to use the distributive property to find the value of 19 • 42 + 19 • 58 mentally. Which expression can she use?a. 19 x(42 + 58)
b. 19 x(42 x 58)
c. (19 + 19) • (42 + 58)
d. 19 • 19 • (42 + 58)

Answers

The answer is a. 19 x(42 + 58). In the expression 19 * 42 + 19 * 58, the common factor is 19. So, it can be taken out and the other factor of each binomial can be put into parenthesis. The general form will be: x * a + x * b = x * (a + b) where x is the common factor. In our expression: 19 * 42 + 19 * 58 = 19 * (42 + 58).

Answer:

19 x (42 + 58)

Step-by-step explanation:

The common term is 19!

Write an expression that has two terms. Your expression should have a variable and a constant