Find the length of each side and the
perimeter.
(5n -17) cm
(2n + 1) cm
n cm

What is the first step of an indirect proof of a number that is divisible by two

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.