What is the value of x? enter your answer in the box. units

AP and CD are parallel. Therefore the segments AC, CR, DR and PD are in proportion:

We have

CR = x

DR = 42

AC = 10

PD = 15

Substitute:

              cross multiply

     divide both sides by 15

x = 28

Step-by-step explanation:

We have similar triangles so

RC              RD

=

RA                RP

Substituting in

x                42

=

x+10                42+15

x                42

=

x+10                57

Using cross products

57*x = 42(x+10)

Distribute

57x = 42x+420

Subtract 42 from each side

57x-42x = 42x-42x+420

15x = 420

Divide by 15

15x/15 = 420/15

x = 28

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

the weight of the object inside the box!