What is 278 rounded to. i think it's 280

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

What are the soultion(s) to the quadratic equation 40- x^2=0

Simplify 24÷(-2)(3)+7 a. -29 b. 3 c. 11