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konstantin123 [22]
3 years ago
13

I don’t understand this. The number line question the first one.

Mathematics
1 answer:
Mama L [17]3 years ago
8 0

Answer:

-2 + 5 = 3

Step-by-step explanation:

The arrow represents an addition, you start with -2 and add 5, so you end up at +3.

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John is trying to drain a swimming pool. He has two pumps, but he can only use one at a time. He knows that the time a pump take
xeze [42]
What do you mean this sentence?
the time a pump takes to drain the pool varies inversely with the power in watts of the pump,
The meaning would be : if we have a power in watts greater the time to drag the pool will be less because the relation between power and time is inverse.  

40 watts--------------5 hours) 
100 watts------------  x

because the relation between power and time is inverse, we multiply directly.
40 watts(5 hours)=100 watts x
x=(200 watts hours) / 100 watts=2 hours.

Answer: the time would be 2 hours.   (the new pump is faster)
8 0
3 years ago
If the area of a circular pool is 300 square yards, what is its radius?
elixir [45]

Answer:

<h2>radius = 9.77 yards</h2>

Step-by-step explanation:

Since the pool is circular

Area of a circle = πr²

where

r is the radius

From the question

Area = 300 square yards

To find the radius substitute the value of the area into the above formula and solve for the radius

That's

300 = πr²

Divide both sides by π

We have

{r}^{2}  =  \frac{300}{\pi}

Find the square root of both sides

That's

r =  \sqrt{ \frac{300}{\pi} }

r = 9.7720502

We have the final answer as

<h3>radius = 9.77 yards</h3>

Hope this helps you

4 0
3 years ago
Which of the following is a correct interpretation of the expression -4 - (-7)−4−(−7)minus, 4, minus, left parenthesis, minus, 7
romanna [79]

Answer:

B

Step-by-step explanation:

you  take away the 7 and it then b

6 0
3 years ago
Ratios Rates and Proportion
seraphim [82]
56 for 3 is the lowest price
8 0
3 years ago
A train travels at a constant rate of 45 miles per hour.
givi [52]
A. d=45t
b. 112.5 miles. 112.5=45•2.5
6 0
3 years ago
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