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NNADVOKAT [17]
3 years ago
6

Ana and Bella are sisters.They are responsible for keeping the

Mathematics
1 answer:
IgorLugansk [536]3 years ago
6 0

Answer:

Bella can complete work alone in 120 minutes

Step-by-step explanation:

Ana and Bella together can  complete the shoveling in 30 minutes.

They can do a part of work in 1 minute = \frac{1}{30}

Ana can do work alone in 40 minutes

She can do part of work in 1 minute = \frac{1}{40}

So, Bella can do a part of work in 1  minute =  \frac{1}{30}-\frac{1}{40}

                                                                        =  \frac{1}{120}

Bella can do \frac{1}{120} part of work in 1  minute

Bella can do whole work in minutes = 120

Hence Bella can complete work alone in 120 minutes

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A square pyramid has a base length of 4 inches. The height of each triangular face is 12 inches. What is the surface area of the
Wittaler [7]

Answer:

The surface area of the given pyramid is 112 inches^{2}.

Step-by-step explanation:

Base length of the pyramid = 4 inches

Area of the base = length^{2}

                            = 4^{2}

                            = 16

Area of its base = 16 inches^{2}

Area of one of its triangular surface = \frac{1}{2} x base x height

                                 = \frac{1}{2} x 4 x 12

                                 = 2 x 12

                                 = 24 inches^{2}

Area of all its four triangular surfaces = 4 x 24

                                                       = 96 inches^{2}

surface area of the pyramid = sum of areas of all its surfaces

                                               = 16 + 96

                                       = 112 inches^{2}

The surface area of the given pyramid is 112 inches^{2}.

8 0
3 years ago
How can you check the correctness of a division answer that has no remainder
gregori [183]
Multiply your outside number and your answer to see if you got the number inside the box
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3 years ago
Which graph represents a function with a rate of change of 0.5?
Westkost [7]
It’s 5 because the other ones not important
3 0
3 years ago
Consider the circles shown. Circle A has a radius of 6 inches. Circle B has a radius 20% greater than
butalik [34]

Answer:

Answer should be D and E

Step-by-step explanation:

First, you need to figure out the radius of B.

As radius of A is 6 in, 20% of 6in would be 1.2in. So total radius of B = 6+1.2 = 7.2

Now you get the radius of B, calculate th area of B using the formula πr^2.

= π(7.2)^2 = 162.86 = area of B

Now, all answers except D and E is smaller than B. So, the answer would be D and E.

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9. Simplify: √32a/√2a
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