An expression with 4 terms, containing the coefficient 3,6, and 9

Angel entered a triathlon (a three-part race). he swam 1 mile, rode his bike 30 miles, and ran 10 miles. how far did he go altogether? a. 11 miles b. 123 miles c. 41 miles d. 40 miles

Which of the following is true for the relation f(x)=2x^2+1

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.