Romona has $800 in her bank account

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

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 = ∅

The ratio of the perimeters of two similar triangles is 4: 3. what are the areas of these triangles if the sum of their areas is 130cm2?