What is the mathematical explanation of perpendicular?

What is (5+2i) * (5+2i) ?

Vector u is represented by the directed line segment RS and vector v is represented by the directed line segment OP. if R = (8,-2), S = (11,-6), O = (-3,-9), and P = (0,-13), are u and v equal?

2.570 plus 0.14 rounding to estimate

How many kilometers is 3.44 x 108 inches? (there are 0.61 miles in 1 km) ?

In a bag of 100 balloons, 12 are red and 13 are green. What fraction of the balloons in the bag are not red or green?

Which of the following has a solution set of x? (x + 1 < - 1) ∩ (x + 1 < 1) (x + 1 ≤ 1) ∩ (x + 1 ≥ 1) (x + 1 1)

Jemma keeps a log of the books read during a summer reading program. She creates the line plot. Each dot represents the number of books read in one week. How can you determine how many weeks long the summer reading program was?

A glacier is a giant mass of rocks and ice that flows downhill like a river. a certain glacier moves at a rate of 22 inches a day. Find the distance in feet the glacier moves in a year. (assume 365 days a year)

Evaluate 1/3 divided by 1/3

Is it possible to have an expression that uses brackets without using any parentheses?