Answers by visitors named: le chat dodu

r (2d + 3t)

In your question, 75 km doesn't make sense/looks like a typo. Was this supposed to be a starting time instead? The solution below ignores it. Let C be the point at which the scooters meet. Let x be the distance from A to C, in km. Then 165-x is the distan...

To start with, multiply the first fraction by (x+1)/(x+1) and the second fraction by (x-2)/(x-2). This will give the two fractions a common denominator, that will then allow you to add the fractions together.

Excellent!

Let x be the number of students in the class. (0.01x)(x) + 13 = 49