exam Maths Puzzle Numerical Ability

evaluate each expression when a=9, b=-3, and c=7

1. 4a+7
2. c(c+3)
3. 7b+2a

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Please help me I having trouble with this problem.

Science and medicine.Celsius temperature reading can be converted to Fahrenheit reading using the formula F=9/5 C=32. Let A = (0,0), B = (4,2), C = (1,3), find the exact size of angle CAB. Justify your answer without your protractor.