Answer: 16 hours
Step-by-step explanation:
The two equations are:
840 + 17x
and
760 + 22x
with x being the amount of hours
840 + 17x = 760 + 22x
-760
80 + 17x = 22x
-17x
80 = 5x
/5
16 = x
840 + 17(16) = 1,112
760 + 22(16) = 1,112
Answer:
(1;1)
Step-by-step explanation:
1. if y=2x-1, then it is possible to substitute 2x-1 into the 2d equation:
5x-4(2x-1)=1, ⇒ 5x-8x+4=1, ⇔ -3x=-3, ⇔ x= 1;
2. if x=1, then y=2x-1=2-1= 1.
3. the required pair is (1;1)
I believe the answer is 144. Because the exponent of 2 is on the outside of the parentheses, we multiply a and b first. 3 times 4 is 12 and 12^2 is 144
Average speed:
(60+40)/2 = 50 mph