Answer:
r = -4
Step-by-step explanation:
If M is the midpoint of DE, that would mean that the distance from M to D and M to E would be the same.
This creates the equation 1-8r=13-5r.
Now it's just simple algebra.
You add 8r to both sides, creating 1=13+3r. Then, you subtract 13 from both sides, getting 3r=-12. Dividing both sides by 3 and solving for r, you get r=-4.
Checking our answer, you see that 1-8(-4)=1-(-32)=1+32=33, and 13-5(-4)=13-(-20)=13+20=33.
$18 (if each shirt costs the same, 54/3 = 18)
Answer:
C
Step-by-step explanation:
X+y=42, 4y+2x=114
y=42-x
4(42-x)+2x=114
168-4x+2x=114
168-2x=114
168-114=2x
54=2x
54/2=x
27=x
plug 27 into y=42-x
y=42-27
y=15
First divide 228 miles by 6 hours and u get 38 miles per hour
next, divide 285 miles by 38 miles and u get 15/2 or 7.5 hours
the answer is 7 and a half hours
hope this helps! good luck!
