exam Maths Puzzle Numerical Ability

find the domain of f(x)=7+ sqrt 3x+21

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exam Other Question

there are 12 trumpet players in the marching band, but there is only room for 3 of them in the jazz band. how many diffrent combinations of trumpet players could be selected for the jazz band out of the 12?
a. 1728
b. 36
c. 1320
d. 220 Please try and solve both parts to this problem, with the strps for a better understanding. Thank you so much. --Janina

Consider the function {{{ f(x)=x^2+4x+1}}}}.

a) Find