Answer:
27
Step-by-step explanation:
3x3+2x9=27
Answer:
A
Step-by-step explanation:
A. The constants a, b, and c must be real numbers with a not ever equal to zero.
Please vote brainliest <3
Answer:
b
Step-by-step explanation:
b is the right answer
it is
sure
Answer:
by showing dots and correlations in a graph which will have an estimated slope, while not a definite one
Step-by-step explanation:
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