Is the estimated coefficient of the price of pizza statistically significant at the 5% level? You can use either the t-test or the P-value, not both since both gives the same results (read my lecture note on testing hypothesis). What does it mean when you reject the null hypothesis?

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.