At 60 miles per hour, my car's dashboard shows 4000 rpm. this means that the crankshaft, which drives the car, is turning at 4000 revolutions per minute. if a car went 60 miles per hour for 200,000 miles, how many revolutions would the crankshaft have done?

  800,000,000 revolutions

Step-by-step explanation:

At 60 miles per hour, a car travels 1 mile per minute, so the crankshaft is turning ...

  (4000 revolutions/minute)/(1 mile/minute) = 4000 revolutions per mile

Then in 200,000 miles, it will have turned ...

  (200,000 mi)×(4000 rev/mi) = 800,000,000 rev

In scientific notation, that's 8×10^8 revolutions.

dwe

step-by-step explanation:

ewd

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