How do you access the math tutor on for free? Sometimes it says it costs money and then a couple weeks later it's free again. How do I make it become free whenever it tries to charge? I'm on Android phone.

The function v(r)=4/3pir^3 can be used to find the volume of air inside a basketball given its radius. what does v(r) represent

Cole says the distance between points (-5,0) and (0,-5)is 5 units. is he correct? explain why or why not.

Three students each examine the system of linear equations shown. 8x + 4y = 16 8x + 2y = 8 caleb says there is exactly one solution. jeremy says there is no solution. kim says there are infinitely many solutions. which student is correct? provide mathematical reasoning to support your answer. answer in complete sentences. : d