A 150-pound person uses 5.1 calories per minute when walking at a speed of 4 mph. How long must a person walk at this speed A person must walk for at least minutes in order to use at least 150 calories.
(Round up to the nearest minute.)

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

What is this inequality notation? t is less then or equal to 2

Which is the graph of the piecewise function f(x)? f(x)=[tex]f(x) = \left \{ {{-x+1, x\leq 0 } \atop {x+1, x\ \textgreater \ 0}} \right.[/tex]