Answer:
<em>The speeds are 877 km/h and 947 km/h.</em>
Step-by-step explanation:
The slower plane travels at x km/h. The faster plane travels at (x + 70) km/h. The speed of separation is the sum of the speeds, (2x + 70) km/h.
They are 5472 km after 3 hours of travel.
speed = distance/time
2x + 70 = 5472/3
2x + 70 = 1824
2x = 1754
x = 877
The slower plane travels at 877 km/h.
x + 70 = 877 + 70 = 947
The faster plane travels at 947 km/h.
7x-7=4x+14
-4x. -4x
3x-7=14
+7 +7
3x=21
x=7
7(7)-7=4(7)+14
42=42
. i think it's wrong
Number of cups of regular coffee the shop sells = 3d
Let
d = cups of decaffeinated coffee
Three times as many cups of regular coffee as decaffeinated coffee.
Answer:67 is correct D
Step-by-step explanation:use parallel, so 71+x=180-42 x=67 67+71=138, 67= to your answer
option d.
<em>Multiply the top equation by 3 and the bottom equation by 4.</em>
