Does any body know how to tell the difference between parallel and perpendicular lines by looking ot the slope of the line???

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale

The least common denominator of 4/8 and 11/18

Simplify each expression using the definition, identities, and properties of imaginary numbers. match each term in the list on the left to its equivalent simplified form on the right. 1. (i 3)2(-i 0)3(3i 2)4 -4 2. (i 3i -5)2(i 4i -3)0 1 3. (-i 4i 2)(2i)2(i -1i 5)3(i 0)-3 -i 4. i 3[(i 2i 3i 4)(i 0i 2i 5)]2 81