The cost of dinner for mr. and mrs. manning was $34.00, but with the tip, they spent $39.10. what percent tip did they give, rounded to the nearest integer?

Can any one me with the answers to these questions asap?

8.74 rounded to the nearest whole number

An object is accelerating at a constant rate. its velocity in feet per second as a function of time in seconds can be modeled by the linear function v(t) = 2.5t. what does the dependent variable represent for this function? a) acceleration b) distance c) slope d) velocity