Answer:
Read answer below :)
Step-by-step explanation:
So you know that it takes 90 seconds for 10 gallons, right? So you know it's 9 seconds per gallon, removing the 0's (which is the easiest way to simplify).
then you take 8 divided by 60 to find out how long it takes for one gallon.
My math shows this:
A = 9 seconds per 1 gallon
B = 7.5 seconds per 1 gallon
60 seconds for 8 gallons, 30 seconds for 4 gallons, 15 seconds for 2 gallons, 7.5 seconds for 1 gallon. (Notice how I divided by two each time until it was simplified)
Answer:
x = - 2 , y = 2
( - 2, 2)
Step-by-step explanation:
first equation add 1/2 to both sides
second equation subtract 2x from both sides
Solve the first equation
subtract x/2 from both sides
substitute for y in the other equation
add
to 2x
subtract 1 from both sides
divide both sides by
x = - 2
substitute the value of x into an equation
distribute
y = 1 + 1
y = 2
x = -2, y = 2
( - 2, 2)
Number of girls in the school = 675 * 0.56 = 378
2/9 of these are over 16 , so this is:-
378 * 2/9 = 84 Answer
Answer:
2.04 km
Step-by-step explanation:
there are 1,000 m in 1 km
she was 680 x 3 meters = 2,040 m
2,040 m = 2.04 km