Teacher said that these are wrong: Excerpt 1: median
Excerpt 2: median and mode
Summary Questions: 1 and 2
Can you help? Thx

What is best way to getting answer for my exam is

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

For each sentence below, find the value of x that makes each sentence true. (515) 5 = 25* x= (813)2 = 4* x=