James earned a total of $900 this week. this total was $20 less than four times the amount he earned last week. how much money did james earn last week

Can someone me with my hwplz(only the circled ones)

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line