What is typically the first step of an indirect proof

How many distinct pairs of perfect squares differ by 35? (the pair $a, b$ is the same as the pair $b, a$.) ?

During a tunnel construction project, engineers used explosives to excavate partway into a mountain. But due to time constraints and environmental concerns, they later introduced a tunnel boring machine (TBM) to excavate the rest of the tunnel.

Using a number line to order the numbers numbers numbers from least to greatest 0.003 and 0.03 in 0.033 and 0.0 31

A bit is a 0 or a 1. a bit string of length 8 is a sequence of 8 digits, all of which are either 0 and 1. (a) how many bit strings of length 8 are there?

Fifteen times the square of a non-zero number is equal to twelve times the number

What is a equivalent expression to x^-3 using positive exponents?

Explain way in your mind to remember 9x6 and 8x7

60/61177.0 Round to the nearest tenth

It raind during 40% of the days of Chrissys vacation. if it rained on 2 days how many days long was chrissys vacation

How do you imagine Paul Erdös lived and supported himself?