The mean height of 25 pupils is 151cm. One of these pupils is 165 cm and leaves the group. Determine the new mean height of the group.

Give your answer correct to 1 decimal place.

Find dy/dx using implicit differentiation ln(20+e^xy)=y

How do you find the distance of each number from the mean

Jackson earns $25 per hour as a tutor at the college library. he set a weekly spending budget of $130 each week and puts the remaining money in his savings account. how many hours must he work this week to have at least an extra $50 to put in his savings account