Max has an account at school to purchase lunch. The cost of each lunch is $2.40. Max purchases lunch 10 days in one month. Which expression represents this change in his account balance? a (10)(2.40)
b (10)(−2.40)
c (−10)(2.40)
d (−10)(−2.40)

On saturday morning, calls arrive at ticketmaster at a rate of 108 calls per hour. what is the probability of fewer than three calls in a randomly chosen minute?

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

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.