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Fofino [41]
4 years ago
10

If 21 = 2a + b and a=b, find the value of b.

Mathematics
1 answer:
Basile [38]4 years ago
3 0

Answer:

21= 2(7) +(7)

Step-by-step explanation:

2(7)= 14+7=21

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The radius of a sphere is increasing at a rate of 5 mm/s. How fast is the volume increasing when the diameter is 60 mm?
Oduvanchick [21]

Answer:

375m

Step-by-step explanation:

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3 years ago
Solve for a a/22 = -4
Flura [38]

Answer:

a=-88

Step-by-step explanation:

do -4*22=-88

meaing a =-88 becuase

-88/22=-4

8 0
3 years ago
Hello could you help me please?
Ilya [14]

Answer:

C. 6

Step-by-step explanation:

So it says read less thann 25 books --> that means the numbers are 13,14,14,16,19,21,21,22,23, and 24 --> a total of 10 numbers

Then it says read more than 35 books --> that means the numbers are 37,41,42,43 --> a total of 4 numbers

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3 0
3 years ago
Read 2 more answers
How are the expressions 8-15 and 8+(-15) different
Anna007 [38]

I don't think there is any difference, because 8-15=-7, and 8+(-15)=-7, because if you remove the parentheses, you will also get 8-15.

Please mark brainiest! Will really really appreciate it!

3 0
4 years ago
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A semi-circle sits on top of a rectangle to form the figure below. Find its area and perimeter. Use 3.14 for a.
boyakko [2]

9514 1404 393

Answer:

  (d)  A = 14.28 in², P = 14.28 in

Step-by-step explanation:

The figure is wholly contained within a 4" square, which has an area of (4 in)² = 16 in², and a perimeter of 4(4 in) = 16 in. Since the figure is smaller in area and has a shorter perimeter (the top corners are rounded, not square), both answer values must be less than 16.

The only reasonable choice is the last choice: 14.28 in², 14.28 in.

__

If you want to figure this out in detail, you have the area of a rectangle that is 2 in by 4 in, and the area of a semicircle of radius 2 in. The total area is ...

  A = LW +1/2πr²

  A = (2 in)(4 in) + 1/2(3.14)(2 in)² = 8 in² +6.28 in²

  A = 14.28 in²

__

The perimeter is half that of a 4" square, plus half that of a 4" circle.

  P = 1/2(4(4 in) +π(4 in)) = (2 in)(4 +π) = 2(7.14) in

  P = 14.28 in

8 0
3 years ago
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