a highway speed monitor is located on the side of the road that has a speed limit of 45 mph, the system records the speeds of passing vehicles. the data below shows the average speeds of the first 9 cars that pass. 46 56 45 44 45 61 55 53 39 what is the standard deviation to the nearest 10th based on the posted speed limit of 45 mph?

7200

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answer:

c. the third graph

37/3

step-by-step explanation:

step 1: simplify both sides of the equation.

7x+8(x+

1

4

)=3(6x−9)−8

7x+(8)(x)+(8)(

1

4

)=(3)(6x)+(3)(−9)+−8(distribute)

7x+8x+2=18x+−27+−8

(7x+8x)+(2)=(18x)+(−27+−8)(combine like terms)

15x+2=18x+−35

15x+2=18x−35

tep 2: subtract 18x from both sides.

15x+2−18x=18x−35−18x

−3x+2=−35

step 3: subtract 2 from both sides.

−3x+2−2=−35−2

−3x=−37

step 4: divide both sides by -3.

−3x

−3

=

−37

−3

x=

37

3

18.75 gallons

step-by-step explanation: