At a middle school, 40% of seventh graders have taken swimming lessons. If there are 250 studnets in the
seventh grade, how many of them have taken swimming
lessons?

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?