Answer:
distance=rate*time
2520=(r)(3)+(r+90)(3) (they both travel for 3 hours)
2520=3r+3r+270
2520-270=6r
2250=6r
r=2250/6
r=375 mph
r+90=375+90=465 mph
Step-by-step explanation:
Answer:
Step-by-step explanation:
-4 - 7 + 10x = -7 + 6x...combine like terms
10x - 11 = 6x - 7
10x - 6x = -7 + 11
4x = 4
x = 4/4
x = 1.........ONE SOLUTION
She started with 81 baseball cards.