Answer:
A
Step-by-step explanation:
x + y = 4a + 7
x - y = 2a + 5
In both equations, make x the subject of the formula
x = 4a + 7 - y equation 1
x = 2a + 5 + y equation 2
Subtract equation 2 from equation 1
2a + 2 -2y
= 2a + 2
Answer:
486
Step-by-step explanation:
1,985 + 12,000 + x = 14,471
x = 14471 - 12000 - 1985
x = 486
Answer: 2.4 mph.
Step-by-step explanation:
Hello there!
Use the principle of rate x time:
(1/5)*5=1
1 mile per 25 minutes= 2.4 mph
5x + 7 = 107
5x = 100
X = 20
The number is 20