Answer:
a)7x-3x
b)4+28y
Step-by-step explanation:
first one follow bidmas
2nd one just do 4 times 1 =4 and 7y times 4 equals 28y
3 trillion
because just do the math bu bl I really dk
4 lipsticks
15+15=30, 30+30=60
Check the picture below.