Simba Supermarket sells 3000 Zesta Jam at 2000 RWF each for every month. For each 100 RWF increase in price, they would sell 100 Jam. What is the price that would maximize the store’s revenue? with form y = ax2 + bx +c

What is the missing step in this proof ?

Suppose that in 2008 , 840,800 citizens died of a certain disease assuming the population of teh country is 399 miliion, what is the mortality rate in units of deaths per 100,000 people?

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?