Answer:
X=110°
Step-by-step explanation:
Set up a system of equations:
x + y = 9
1/x +1/y = 1/2
The easiest way to solve would be substitution.
x + y = 9 can be solved for y:
y = 9 - x
Then plug this into the second equation and solve for x:
1/x + 1/(9-x) = 1/2
(9-x) + x = x(9-x)/2
9 = (9x-x²)2
18 = 9x - x²
x² - 9x + 18 = 0
(x-6)(x-3) = 0
x = 6, 3
You can check your answer by plugging the two numbers back into both of the equations:
6 + 3 = 9
1/6 + 1/3 = 1/2
The two numbers are 6 and 3.
Answer:
7/6
Step-by-step explanation:
5/2-4/3
=(5*3-4*2)/2*3
=(15-8)/6
=7/6
Answer:
.88
Step-by-step explanation:
The standard deviation is the square root of the variance.
Answer:
15x + 10
Step-by-step explanation:
5(3x + 2)
15x + 10
