14. If all variables remain unchanged except the price of screen size (Ps), which increases by $20, then the demand for Grapple tablets will: 15. You can tell by the sign preceding the price of screen size variable (Pxx) that screen size is a: In questions 16-18 use these values in the multivariate demand function for Grapple tablets: PE = $500 Ph= $800 Pr = $700 Pav = $50 Pac = $100 Pam = $30 Ag = 40 A = $100,000 C=2 Y=$30,000 16. After the values above are entered into your demand function, what quantity of Grapple tablets will be demanded? Be very careful with this calculation. This value will be used again below. 17. What is the point price elasticity of demand for Grapple tablets at the above price (P )? Show the values you use in the formula and work out completely. Be sure to show the sign. Does this value indicate a very sensitive (elastic; responsive) relationship (write a one sentence comment)? The formula is: 18. What is the point cross-price elasticity of Grapple tablets with respect to the above price of Ronovo tablets (P.)? Show the values you use in the formula and work out completely. Be sure to show the sign. Does this value indicate a very sensitive (elastic; responsive) relationship (write a one sentence comment)? The formula is: E= aQq . Pr ap, Qg 19. Write the first derivative of the following function in the space provided on the answer sheet Z =50 + 2X2 - 4X3 + 5X5 20. Write the first derivative of the following function in the space provided on the answer sheet: Y =100 + 6X3 -5X-2 +7X3