Shares of stock

1) If C = $.40 and B = $.50 and 400 items purchased at a total cost of $170.00. How many of C and B were purchased each?2) If stock earned $151,000,000 and earnings represent $1.15 each per share, how many shares of stock are there?3)Write the equation of the line through the indicated point with the indication slope. Write the final answer in the form P=MX+6. The equation of the line is:_____________ (write answer in the slope-intercept form)4) A farmer buys a new tractor for $145,000 and assumes it will have a trade-in value of $82,000 after 10 years. The farmer uses a constant rate of depreciation to determine the annual value of the tracker. Find the linear model for the depreciation value V of the tractor T years after it was purchased. V = ___________ (Write the answer in slope-intercept form).