The difference of 7 and a number X is 10

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Cannot be done.

Inverse operations to the rescue - again!

So, you'd need to add 7+10 (the word 'difference' signals subtraction). You should get 17.

So, x=17.

CHECK! 17-7=10

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step-by-step explanation:

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.