Estimate the sum 99+53 to the nearest ten

Can someone me my sister? she is in third grade. 50 points and brainlist! ones that are not answered. plz and thx!

The average number of vehicles waiting in line to enter a parking lot can be modeled by the function f left parenthesis x right x squared over 2 left parenthesis 1 minus x right parenthesis endfraction , where x is a number between 0 and 1 known as the traffic intensity. find the rate of change of the number of vehicles waiting with respect to the traffic intensity for the intensities (a) xequals0.3 and (b) xequals0.6.

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?