The mean age of 21 people in a theatre is 18 year-old. One person who is 31 year-old leaves the theatre.

Determine the new mean age of the remaining people.

2x + 1 < 5 solve the following inequality. then place the correct number in the box provided.

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed

Can someone me with these two circle theorem questions asap?