Ella is selling cookies for $4 per dozen. She pays $10 for ingredients. If she ends up with
a profit of $66 how many dozen cookies
did she sell?

Find the value of 1715⋅211.though these numbers aren't quite as nice as the ones from the example or the previous part, the procedure is the same, so this is really no more difficult. give the numerator followed by the denominator, separated by a comma.

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Solve 2x+y=3 x+y=5 in substitution method