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3 years ago

Need help don't know this

Mathematics

2 answers:

ipn [44]3 years ago

8 0

Answer:

Step-by-step explanation:

Given,

-5a + a - 7a

[All will get added up as all have the same variable a ]

= -4a - 7a

= -11a (Ans)

Nadusha1986 [10]3 years ago

6 0

Answer:

-11a

Is tge required answer.

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If 3500 miles are traveled at a rate of 175 miles per hour, what is the time in hours? (hint: Distance = Rate * Time)

laiz [17]

3500 miles divided by 175 Miles Per Hour. 3500/175=20 Hours.

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3 years ago

Q = 15 a = 16 What would you do with q and a to get 240?

ch4aika [34]

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3 years ago

What is the area of a sector with a central angle of 108 degrees and a diameter of 21.2 cm?

Rasek [7]

Answer:

$105.84\ cm^2$

Step-by-step explanation:

step 1

Find the area of the circle

The area of the circle is

$A=\pi r^{2}$

we have

$r=21.2/2=10.6\ cm$ ----> the radius is half the diameter

substitute

$A=\pi (10.6)^{2}$

$A=112.36\pi\ cm^2$

step 2

Find the area of a sector

Remember that

The area of the circle subtends a central angle of 360 degrees

using proportion

Find out the area of a sector with a central angle of 108 degrees

$\frac{112.36\pi}{360^o}=\frac{x}{108^o}\\\\x=112.36\pi(108)/360\\\\x=33.708\pi\ cm^2$

assume

$\pi=3.14$

substitute

$33.708(3.14)=105.84\ cm^2$

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3 years ago

78 round to the nearest tenth

LenaWriter [7]

78 rounded to the nearest tenth is 80

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3 years ago