Sam’s age is 3 years less than three times her brother’s age. Write an expression to represent Sam’s age. Use the variable b to represent her brother’s age. pls help i will give brainliest :3

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.