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Dominik [7]
3 years ago
10

In the diagram below, the radii of the two concentric circles are 3 centimeters and 7 centimeters, respectively.

Mathematics
1 answer:
True [87]3 years ago
5 0

Answer:

125.6 cm²

Step-by-step explanation:

Area of the shaded region = area of larger circle - area of the smaller circle

Area of the smaller circle = πr²

π = 3.14, r = 3 cm

Area of smaller circle = 3.14*3² = 3.14*9 = 28.26 cm²

Area of larger circle = πr²

π = 3.14, r = 7

Area of larger circle = 3.14*7² = 3.14*49 = 153.86 cm²

Area of the shaded region = 153.86 - 28.26 = 125.6 cm²

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A crew of highway workers paved 1/5 mile in 1/8 hour. If they work at the same rate, how much will they
Elan Coil [88]

Answer:

The easiest approach is to realise that one hour is 3 times longer than 20 minutes. The longer the time, the more they will pave.

215 of a mile, in 20 minutes, how much in 60 minutes?#

They will pave 3 times more.

215×31=615 of a mile

615=25 of a mile

You could also use the 'unitary method' where you find out how much they pave in ONE minute (divide by 20) and them multiply by 60 to find how much in one hour.

Look at what happens:

215÷20×60

=215×120×603

=215×3 ← exactly the same maths.

=25

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3 years ago
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Answer:

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Step-by-step explanation:

5 0
3 years ago
Which is the best estimate for the mass of a pair of eyeglasses? A. 25 grams B. 250 grams C. 25 kilograms D. 250 kilograms
Yuliya22 [10]
About A. 25 grams because glasses are really not heavy at all and the other options are way too illogical.
Hope this helps!
4 0
3 years ago
What is the area or the figure below?
nataly862011 [7]
U have to cross out the 10 then u have those 4 5s 5x5=25 5x5=25 25+25=50.





(My answer might be wrong so wait until other ppl answer. If I got riGhT like my thing -3-)
5 0
3 years ago
Read 2 more answers
HELP!! WILL GIVE BRAINLIEST TO WHOEVER ANSWERS CORRECTLY
True [87]

2. You simplified parenthesis on both sides

3. Subtracted 14 from -25 on right side

6. Divided each side by 9

6 0
3 years ago
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