80+ 80= 160 miles
160 miles/ 7 hours= 22.857 miles per hour
9514 1404 393
Answer:
y = 10
Step-by-step explanation:
Put -3 where x is and solve for y.
4(-3) +3y = 18
-4 +y = 6 . . . . . . . divide by 3
y = 10 . . . . . . . . . add 4
Answer:
a+c =11
a +3c = 19
a =7 and c = 4
Step-by-step explanation:
Let a = price of one adult
c = price of one child
We know one adult and one child = 11
a+c =11
Mrs smith and 3 children spent 19
a +3c = 19
We have 2 equations and 2 unknowns
a+c =11
a +3c = 19
Multiply the first equation by -1 so we can eliminate a
-a-c=-11
a+3c=19
----------------
2c = 8
Divide by 2
2c/2 = 8/2
c=4
Each child equals 4 dollars
Now we need to find a
a + c= 11
a+4 = 11
Subtract 4 from each side
a+4-4 = 11-4
a = 7
The adult is 7
Step-by-step explanation:
I don't know the answer to that.
Answer:
13, 14, 15, 16
Step-by-step explanation:
Call the first number n. Then the next three consecutive numbers (assuming integers) are n + 1, n + 2, n + 3.
The mean is the total of the numbers divided by how many there are.
Simplify and multiply by 4.
The first number is 13.
The median is 14.5, halfway between the "middle" numbers 14 and 15. This is just a check; no additional equation is necessary.