Answer:
(2)
Step-by-step explanation:
2(2x-1) = 5x²
expand
4x - 2 = 5x²
subtract (4x-2) from both sides to make it a quadratic equation
5x² -4x + 2 = 0
plug into the quadratic formula
ax² + bx + c
thus, the coefficient attached to i is +- √6/5, making (2) our answer
(1) is not the answer because our answer would then be
a + bi = 2/5 + √6/5 * i * i = 2/5 - √6/5, which isn't our answer
You know that you need two already to make one hexagon. So, if you multiply, or add two four times, 2+2+2+2, you would get eight.
An equilateral triangle has 3 equal sides. Since one side is 14 cm, then all sides are 14 cm. You multiply 4 by 3 and you get your answer.
14*3=42. The perimeter is 42cm.
If you're asking what is the unit rate of 3 1/2 in 1 1/4 things then it is 7/2 * 4/5 which is 14/5 or 2 4/5