Make sure that the subtraction is set up in the correct order. We are subtracting -7+2 FROM 2n-1.
(2n-1) - (-7n+2)
Distribute the negative.
(2n-1) + (7n-2)
Combine like terms.
9n - 3
The answer is B.
Answer:
-13+n
Step-by-step explanation:
n stands for a number
Answer:
(1) You can try to calculate length of AB, BC, CD, AD, AC, BD to make sure the order of vertices. (other way: you can plot them to see form of trapezoid and then find out positions of 4 vertices)
(2) From (1), identify 2 bases of trapezoid: AB and CD
=> Length of mid segment = (lengAB + lengCD)/2
=[ sqrt[(0-3)^2+(5-3)^2] + sqrt[(5-(-1))^2+(-2-2)^2] ]/2 = ~5.4
Other way
Define two points create mid segment P1 and P2
P1 is middle of AD = (A+D)/2 = (-0.5,3.5)
P2 is middle of BC = (B+C)/2 = (4,0.5)
=> Length of P1P2 = sqrt[(-0.5-4)^2+(3.5-0.5)^2] = 5.4
Y=mx+b
m=slope
b=yintercept
find slope and y intercept
slope is rise/run
it goes up y units and goes x units to the right
so
we see it goes up 2 and to the right 4
2/4=1/2
slope=1/2
yintercept is where the line crosses the y axis (up and down line)
it crosses at y=-2
y=mx+b
m=1/2
b=-2
y=1/2x-2
answer is 2nd option
