exam Maths Puzzle Numerical Ability

Hi, I am some trouble with two problems for my homework. I hope some one can help me please .

Perform the indicated operations:
2√[48] + 7√[12] �√[27]
Ra

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exam Other Question

I am supposed to simplify the sqrt of 3x/2. From the work I have done, I do not think it simplifies, am I doing something wrong??? Thanks for your help. Can you please help me with this question? Find the measue of angel C in the triangle with the following dimensions a= 28, b= 35, c= 17
a. 52.16
b. 42.39
c. 28.65
d. 31.72
Thank you