2x + y = 5
x − 2y = 10
y = 5 − 2x
x − 2(5 − 2x) = 10
x − 10 + 4x = 10
5x − 10 = 10
<em>add 10 to each side</em>
<em>5x-10+10 = 10 + 10</em>
<em>5x=20</em>
5x = 0 <em>this is the error</em>
He needs to add 10 to each side
Answer:
-9+5y=-4x
-20+9y=-11x
-4x
+ -11x
_____
-15x
Step-by-step explanation:
i dont really know what i did i kinda just guessed because im not that smart
<span>a)
2=(x-2.7)/.5
(2)(.5) = x-2.7
1=x-2.7
x=3.7
-2.5=(x-2.7)/.5
(-2.5)(.5) = x-2.7
-1.25 =x-2.7
x=2.7-1.25 = 1.45
b)
95% of the students' score lie within 2 standard deviation of the mean. Therefore, the top 2.5% corresponds to a z value of 2.
The limits are (2, infinity) --- top 2.5 %</span>
That depends on the position of the angle, if it's a central angle then the length of arc = 1/4 the circumference
so L = (1/4)(2pi(70))= 110 feet approximately
<span />
