Answer:
s= -5
Step-by-step explanation:
-12=8+4s
We move all terms to the left:
-12-(8+4s)=0
We add all the numbers together, and all the variables
-(4s+8)-12=0
We get rid of parentheses
-4s-8-12=0
We add all the numbers together, and all the variables
-4s-20=0
We move all terms containing s to the left, all other terms to the right
-4s=20
s=20/-4
s=-5
To find the average speed, we need to find his speed during 3/4 of the trip and then the 52.5 miles.
So you know that 52.5 is 1/4 of his total trip. That means if we multiply that by 3, that's how many miles he traveled in 2.5hrs. (157.5)
To calculate speed, divide distance by time.
For 3/4 of his trip (157.5), it took him 2.5 hours.
157.5/2.5 = 63mph
For the remaining 52.5 miles, it took him an hour.
52.5/1 = 52.5mph
Now average those two speeds to get the average speed for the whole trip.
(63+52.5)/2= 57.6mph
Answer:
2 ¹/12
Step-by-step explanation:
convert 1 4/12 to an improper fraction
(1×12+4)=16/12
16/12+9/12=25/12
convert 25/12 to a mixed fraction
=2 ¹/12
So im going to factor each expressions
15k + 9 are both divisible by 3 so it is the same as
3(5k+3) (distribute the 3 and you get your original equation)
3(2k+3) +9k
6k+9+9k
15K+9 and do the same thing above
Answer:
For an nth term U(n) = a + (n - 1)d
n = number of terms
a = first term
d = common difference
a = 5
d = 2 - 5 = - 3
U(n) = 5 + (n -1)-3
= 5 - 3n + 3
= 8 - 3n
The formula for the sequence is 8 - 3n
Hope this helps