1)Solve using intervals:

a) 6x⁴ - 7x³ - 4x² + 8x + 12 greater than 0

2) Cookies are packaged in boxes that measure 18 cm by 20cm by 6cm. A larger box is being designed by increasing the length, width, and height of the smaller box by the same length so that the volume is at least 5280 cm³. What are the minimum dimensions of the larger box?

3) The price, p, in dollars, of a stock t years after 1999 can be modelled by the function

p(t) = 0.5t³ - 5.5t² + 14t. When will the price of the stock be more than $90?

4) Solve x⁵ + 7x³ + 6x less than 5x⁴ + 7x² +2