Can someone please help me with these two questions

Q1 answer is C and next answer is D

Step-by-step explanation:

I gave answer first

4/7 + 8/15 = 1 11/105

Step-by-step explanation:

4/7 + 8/15 = 1 11/105

= (4/7 x 15/15) + (8/15 x 7/7)

= 60/105 + 56/105

= 116/105 = 1 11/105

Let,y =  the time to dancex = time for mathtotal time spent on practicing dance and math = 80 minutes  extra time for dance = 20 minutespart a: write a pair of linear equations: x + y = 80 (total time spent on dance and math)and  y = x + 20 (extra 20 minutes for dancing)part b: time spent on practicing math:   replace y = 20+x in the first equationwe get,x + 20 + x = 80combining like terms2x = 60dividing both sides by 2x = 30 minutes  part c: is it possible for pam to have spent 60 minutes practicing dance every day? explain your reasoning.  no. because she practices math for 30 minutes; so she spends 20 minutes more on practicing dance, which means she spends: 30min + 20 min = 50 minutes on practicing dance.