Find each sum.
1. 56+ (-56) = 0
The number series 1, 2, 3, 4, 55, 56. Therefore, 1596 is the sum of positive integers.
A: Equilateral
B: Obtuse
C: Obtuse
D: Right
E: Obtuse
F: Acute
Answer:
- boat: 16 mph
- current: 4 mph
Step-by-step explanation:
speed = distance / time
The rate downriver is (60 mi)/(3 h) = 20 mi/h.
The rate upriver is (60 mi)/(5 h) = 12 mi/h.
The rate of the boat in still water is the average of these:
(20 +12)/2 mi/h = 16 mi/h
The rate of the current is the difference between the boat speed and actual speed:
16 mi/h - 12 mi/h = 4 mi/h
You have a system of equations

.
1. Substitude right side of second equation into the left side of the first equation:

.
2. Solve this equation:

.
3. Find y:
for

,
for

.
4. The solutions of the system are: (3,-12) and (5,-24).
Answer: Correct choice is A.
Answer:
7920 yards
Step-by-step explanation:
just use a calculator next time. Do miles to yards converter in :)