Express the equation a)20 less than a number b)half a number is another number. there sum is 30 c)2/3 if weight of a boy is 32kg d)cost of 5 pens is 90$ e)milly's father is 49 years old. he is 4 years older 3 times milly's age pls i need the answer

Need ! give step by step solutions on how to solve number one [tex]\frac{9-2\sqrt{3} }{12+\sqrt{3} }[/tex] number two [tex]x+4=\sqrt{13x-20}[/tex] number three (domain and range) [tex]f(x)=2\sqrt[3]{x} +1[/tex]

Which term best describes the association between variables a and b? no association a negative linear association a positive linear association a nonlinear association a scatterplot with an x axis labeled, variable a from zero to ten in increments of two and the y axis labeled, variable b from zero to one hundred forty in increments of twenty with fifteen points in a positive trend.

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)