I need help with questions 7-8 and I needa show my work who’s down ??

Answer: 7-8=-1
Step-by-step explanation: you have 7 and you need to take away 8 so you have to subtract and ypu get -1
Answer:
Step-by-step explanation:
Well, I don't know if I'm right but I think question 8 would be, 10 to the power of 8 is 100,000 times 3.85 is 385,000,000. Then 1.75 times 10 to the power of 3 is 1,750. Well, 4 quarters equal 1 dollar so you would need 350 million quarters and I'm tired of doing the math for 1,750 so I don't know...