Literal equations are I'm pretty sure more straight forward while algebraic is complication and requires a lot of steps
First question: -2
Answer: 2(cos 180° + i sin 180°)
2(-1 + i 0) = -2
Second question: -2i
Answer: 2(cos 270° + i sin 270°)
2(0 + i (-1)) = -2i
Okay so I wont be able to show the row here but I will try my best.
7(5x-4y=28) = 35x-28y=196
-5(7x+5y=18) = -35x-25y=-90
= -53y=106
= y=-2
5x-4(-2) =28
5x+8=28
5x=20
x=4
Answer:
Step-by-step explanation:
If you drive straight north then turn and drive straight east, you have driven 2 sides of a right triangle. The straight line distance from where you are to where you started from is the hypotenuse of the right triangle. Use Pythagorean's Theorem to solve:
and
and
That means that length of the hypotenuse is 45.
45 miles is the distance.