First you'll need to get the same denominator. So instead of 3/5 and 3/8 you'll have 24/40 and 15/40. Now that we've changed the value of the denominator, the 40/40 will now represents the 1 hour that Jenny has before bedtime. So you add 24/40 and 15/40 and get 39/40. 39/40 stands for the time that Jenny has already spent brushing her teeth and texting her friend all together. Since the 1 hour is 40/40 subtract 39/40 from it to get 1/40. 1/40 is equal to the rest of the time Jenny spends reading or 1.5 minutes.
Answer:
Step-by-step explanation:
4)
28 in base 10
base 5=28*2=56
base 2=28*5=140
5)
7 in base 10
base 5=7*2=14
base 2=7*5=35
6)
100 in base 2
base 5=100*5/2=500/2=250
base 10=100*5=500
7)
10010 in base 2
base 5=10010*5/2=50050/2=25025
base 10=10010*5=50050
8)
10111 in base 2
base 5=10111*5/2=50555/2=25277.5
base 10=100*5=50555
