A man decides to give his son 1,000 LL. for every math exercise solved properly so as to encourage him to study mathematics, but takes back 500 L. L. if the solution is wrong. After 30 exercises, each has given and received the same amount. How many exercises did the son solve properly?

Need on this geometry question. explain how you did it.

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

Solve the equation using the zero-product property. -3n(7n - 5) = 0 a. 0, -5/7 b. -1/3, -5/7 c. -1/3, 5/7 d. 0, 5/7