Matlab questions

I need some help with these (matlab)3 questions (17,25,34)

co alculate the angle (in degrees) by using the law of cosines. (Law of cosines: c-a2+b2-2abcos ) (b) Calculate the angles and (in degrees) using the law of sines (e) Check that the sum of the angles is 180. 17. A frustum of cone is filled with ice cream such that / the portion above the cone is a hemisphere. Define the variables d 1.25 in., do-2.25 in., h-2 in., and determine the volume of the ice cream. Chapter l: Starting with MATLAB 0 0C Tul, alld how many seats will remain empty in the vans if enough vans are used to transport all the people that did not fit into the buses. (Hint: Use MATLAB built-in functions fix and cei1.) 24. Change the display to format long g. Assign the number 7E8/13 to a variable, and then use the variable in a mathematical expression to calculate the following by typing one command: (a) Round the number to the nearest tenth (b) Round the number to the nearest million. 25. The voltage difference Vab between points a and b in the Wheatstone bridge circuit is given by: where c#A2/R, and d-R3/R4 . Calculate the lab if V=15V, R.-119.8 R2= 120.5 R3=121.2 and R4-119.3 26. The current in a series RCL circuit is given by: JJ. Ille greatest common divisor is the largest positive integer that divides the numbers wthout a remainder. For example, the greatest common divisor of 8 and 12 is 4. Use the MATLAB Help Window to find a MATLAB built-in function that determines the greatest common divisor of two numbers. Then use the function to show that the greatest common divisor of: (a) 91 and 147 is 7 (b) 555 and 962 is 37. 34. The amount of energy E (in joules) that is released by an earthquake is given by: E = 1.74 x 1019 x 101 44M where M is the magnitude of the earthquake on the Richter scale (a) Determine the energy that was released from the Anchorage earthquake (1964, Alaska, USA), magnitude 9.2. (b) The energy released in Lisbon earthquake (Portugal) in 1755 was one- half the energy released in the Anchorage earthquake. Determine the magnitude of the earthquake in Lisbon on the Richter scale 35. According to the Doppler effect of light, the perceived wavelength 2, of a light source with a wavelength of , is given by: where c is the speed of light (about 100 x 10 m/s) and r is the speed the observer moves toward the light source. Calculate the speed the observer has to move in order to see a red light as green. Green wavelength is 530 nm and red wavelength is 630 nm