450 miles/15 gallons is reduced to 30 miles/1 gallon
X/2 + 5 = -10
x/2 = -10 - 5
x/2 = -15
x = -15(2)
x = -30
Answer:
27 and 153 degrees
Step-by-step explanation:
Delta math
Answer:
10
Step-by-step explanation:
Answer: 28
Step-by-step explanation:
The mean of 15 numbers = 12
Then , the sum of the numbers = 12x15 = 180
Let the extra number included be
, then
The new sum = 
And the new total number will increase from 15 to 16
new mean = 13 , so we have :





therefore , the extra number is 28