The figure shows two sectors in which the arcs AB and CD are arcs of concentric circles, centre 0. BD = AC = 4 cm and angle AOB = 1/2 radians. If the perimeter of ABDC is 16cm, calculate
(a) OB,
(b) the area of ABDC.

PLEASE HEL

The graph shows the prices of different numbers of bushels of corn at a store in the current year. the table shows the prices of different numbers of bushels of corn at the same store in the previous year. previous year number of bushels price of corn (dollars) 2 10 4 20 6 30 8 40 part a: describe in words how you can find the rate of change of a bushel of corn in the current year, and find the value. part b: how many dollars more is the price of a bushel of corn in the current year than the price of a bushel of corn in the previous year? show your work.

Quick translate "x is 12 units from 20" into an equation. what are the values of x being described? if you can answer any of my other questions that'd be great too

W-16=-12 solve each one step equation plz