1:How much Does It cost to produce 900 printed shirts?

Factor the expression using the gcf. the expression 21m−49n factored using the gcf

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

If set d is not the empty set but is a subset of set e, then which of the following is true? d ∩ e = d d ∩ e = e d ∩ e = ∅