Solve I need it really quickly

Mathematics

2 answers:

swat323 years ago

7 0

3x - 2 = 28 <=>

3x = 30 <=>

x = 10

soldier1979 [14.2K]3 years ago

4 0

X=10 hope that helped

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What percent was the server's tip if the customer left $1.75 for a $12.50 meal.

tatuchka [14]

12.5x=1.75

Solve for x:
1.75/12.5 = 0.14

1. Use the equation 12.5x=1.75
2. Now solve for x.
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b. Now, you have .14
c. .14 is 14%
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7 0

3 years ago

When truckers are on long-haul drives, their driving logs must reflect their average speed. Average speed is the total distance

bekas [8.4K]

a) $v=\frac{d_{tot}}{t_{tot}}=\frac{(3 h)(60 mph)+20 mi}{3 h +t_2}$

The average speed is equal to the ratio between the total distance ( $d_{tot}$ and the total time taken ( $t_{tot}$ ):

$v=\frac{d_{tot}}{t_{tot}}$

the distance travelled by the trucker in the first 3 hour can be written as the time multiplied by the velocity:

$d_1 = (3 h)(60 mph)=180 mi$

So the total distance is

$d_{tot}=d_1 +d_2 = 180 mi+20 mi=200 mi$

The total time is equal to the first 3 hours + the time taken to cover the following 20 miles in the city:

$t_{tot}=3 h +t_2$

So, the equation can be rewritten as:

$v=\frac{d_{tot}}{t_{tot}}=\frac{(3 h)(60 mph)+20 mi}{3 h +t_2}$

b) 0.50 h (half a hour)

Since we know the value of the average speed, $v=57.14 mph$ , we can substitute it into the previous equation to find the value of $t_2$ , the time the trucker drove in the city: