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Calculate

√3+√3+√3+√3=

A

√12

B

√81

C

4√3

D

3√4

Write as short as possible

y=√x+√5+√x+√7

A

y=2√x+√12

B

y=2√x+√5+√7

C

y=√2x+12

D

y=√35x2

Write as short as possible

P=15√a+6√b+5√a−2√b

A

P=20√a+8√b

B

P=24√ab

C

P=20√a+4√b

D

cannot be written any shorter