What is 2.56 x 10^-5 ÷ 4.0 x 10^-1need right

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

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

Maria walks a round trip of 0.75 mile to school every day. how many miles will she walk in 4.5 days