Suppose an airplane climbs 15 feet for every 40 feet it moves forward. what is the slope of this airplane's ascent?
a) -
3
8
b) -
8
3
c)
1
3
d)
3
8

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.