Harold buys a number of calculators for a total of R2 000. He gives 3 of these calculators to needy learners and sells all the remaining calculators for a total of R1 750. He sold each calculator for R50 more than he originally paid. How many calculators did he originally buy?​

What is the area of triangle abc if a = 8, b = 11, and c = 15?

One of the inventors of integrated circuits observed that the number of transistors that fit on an integrated circuit will double every 24 months. what type of relationship most appropriately models this situation?

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.