Jacob has serveral babysitting jobs. on one job he earnefd $10 an hour plus an extra $20 since there where 3 children. on another job, he earned $15 an hour. he earned the same amount of money at both jobs. how many hours did he work and how much did he earn?

Jacob worked 4 hours and earned $60

Step-by-step explanation:

Let

y > the amount earned

x > the number of hours

First job

The linear equation is equal to

y=10x+20 > equation A

Second job

The linear equation is equal to

y=15x > equation B

we know that

He earned the same amount of money at both jobs

To find the number of hours he worked math equation A and equation B

10x+20=15x

solve for x

15x-10x=20

5x=20

x=4 hours

so

For x=4 hours

y=10x+20 > y=10(4)+20=$60

y=15x > y=15(4)=$60

For x=4 hours

The amount earned is the same in both works

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

24 units

step-by-step explanation: