What is mathematics?​

Mathematics is a branch of science which involves numbers,space and quantity.

Step-by-step explanation:

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the abstract science of number, quantity, and space. Mathematics may be studied in its own right (pure mathematics),

Step-by-step explanation:

or as it is applied to other disciplines such as physics and engineering (applied mathematics).

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.