Jeanetta collects antique picture frames. In her first year of collecting, she collects 10 frames. Each year, she hopes to collect three more frames than the previous year. The number of frames Jeanetta will have after 10 years of collecting is represented by the expression below.
10∑n=1 10+3(n-1)
How many frames will Jeanetta have after 10 years of collecting?
235
255
1,640
1,649

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.