Which is a simplified form of the expression 3a + 7 – a – 7?

Mathematics

2 answers:

zheka24 [161]2 years ago

7 0

Answer:

A) 2a

Step-by-step explanation:

3a+7-a-7

3a-a+7-7

2a+7-7

lord [1]2 years ago

3 0

Answer:

Choice A.

Step-by-step explanation:

3a + 7 - a - 7 = 3a+7 - a+7 = 3a-a = 2a

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Chapter : Circles 1 question

erica [24]

We can solve this question in 2 ways: either using degrees or converting the degrees into radians.

Since, the question says degrees itself and there is no specification of using radians only, so I have solved it using degrees itself.

Part (a):

Perimeter of sector ORS = 2*Radius + Arc RS = 2*21 + $60* \frac{ \pi }{180} *21 = \frac{ \pi }{3} *21 = 7 \pi$

Part (b):

Area of sector ORS = $\frac{60}{360} * \pi * 21^{2} = \frac{1}{6} * \pi *21*21= \frac{147}{2} \pi$

Area of sector POQ = $\frac{36}{360} * \pi * 14^{2} = \frac{1}{10} * \pi * 196 = \frac{196}{10} \pi$

Thus, area of shaded region
= Area of sector ORS - Area of sector POQ

= $\frac{147}{2} \pi - \frac{196}{10} \pi = \frac{735 - 196}{10} \pi = \frac{539}{10} \pi = 53.9 \pi$

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2 years ago

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sveticcg [70]

Answer:5

Step-by-step explanation:

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2 years ago

Read 2 more answers

Use properties of addition and subtraction to evaluate the expression <br> -42 - 29 - 28

Setler [38]

(-42) (-29) (-28)
-42 - 29 = -71
-71 - 28 = -99

-99 is your answer

hope this helps