For the given number a . find it’s addictive inverse and b. find it’s absolute value. 7.87 the additive inverse of 7.87 is ?

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?

Pls brainliest will be awarded if answer is correct

Iknow the answer but the calculator doesn't seem to give the right one