Which would the phrase "twice the sum of a number and three" look like as a variable expression?

How many zeros does the function f(x)=4x3-x2+1 have

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?

Aline is perpendicular to another line m2= (-1/m1), where m1 is the slope of the original line and m2 is the slope of the perpendicular line. which of the following equations represents the line that passes through the point (-2,1) and is perpendicular to the line below?