Screenshot below solving equations algebra please help

How do i put 3(x+7) in distributive property

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

Amayoral candidate would like to know her residents’ views on a tax on sugar drinks before the mayoral debates. she asks one thousand registered voters from both parties. these voters are an example of a census population convenience sample simple random sample