Answer:
3 + 5 + 7 = 15
they have 15 quarters altogether so answer is 15q
Answer:
i dont know what it means but the right image is 4 times larger than the left image
Step-by-step explanation:
From your equation, you can see that you have a difference of two cubes (aka two cubes being subtracted): 64, which is

, and

.
There is rule for the difference of two cubes:
The difference of two cubes is equal to the difference of the cube roots times a binomial, which is the sum of the squares of the roots plus the product of the roots.
That sounds pretty confusing, but it's much easier to understand when put mathematically. Let's say our two cubes are

and

. The difference of those two cubes is:

In our problem, a = 4 (since

= 64) and b = y (since

. Plug these values into the rule to find the factor of

:

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Answer:
The second train will catch up with the first train in 1.6 hours