Start of by writing 7x+1=50. Subtract 1 from both sides. You will get 50-1=49. Then you have 7x=49. Divide 7 on both sides. 7x/7. 49/7=7. X=7. Therefore x=7. Check your answer by plugging 7 into x. 7(7)=49+1=50. The answer checks out!
“because the train will arrive any minute”
adverb clauses usually start with because, after, if, although
I believe the pronoun in this sentence is <u>your key</u>.
I really think the answer is d
