Plz help me get the right answer

What are the soultion(s) to the quadratic equation 40- x^2=0

Ten times the square of a non-zero number is eqaul to ninety times the number

Abakery recorded the number of muffins and bagels it sold for a seven day period. for the data presented, what does the value of 51 summarize? a) mean of bagels b) mean of muffins c) range of bagels d) range of muffins sample # 1 2 3 4 5 6 7 muffins 61 20 32 58 62 61 56 bagels 34 45 43 42 46 72 75