Answer:
System of equations:
20x + 30y = 650
x + y = 25
Time underwater = 10 hours
Time at the surface = 15 hours
Step-by-step explanation:
Let x = time underwater at 20 km/h.
Let y = time on the surface at 30 km/h.
speed = distance/time
distance = speed * time
distance underwater: 20x
distance on the surface: 30y
total distance: 650
20x + 30y = 650
total time: x + y
total time: 25
x + y = 25
20x + 30y = 650
x + y = 25
20x + 30y = 650
-20x - 20y = -500
--------------------------------
10y = 150
y = 15
x + y = 25
x + 15 = 25
x = 10
40 x 8.50 = 340
340 x .0765 = 26.01
So the employer should withhold $26.01 from her check for social security.
Answer:
10 hours
Step-by-step explanation:
Hello! :)
In 2 hours, he is going up 4 feet and down 1 which means he advances 3 feet every two hours.
15 ft/3 ft=5 ft
2 hours x 5 ft=10 more hours
Hope this could help!
Answer: The empty set
The empty set is a subset for every set.
