I don’t know if I did this correctly. Please help URGENT

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

Match each equation with the operation you can use to solve for the variable. subtract 10. divide by 10. divide by 5. subtract 18. multiply by 10. add 18. add 10. multiply by 5. 5 = 10p arrowright p + 10 = 18 arrowright p + 18 = 5 arrowright 5p = 10 arrowright

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?