What is 0.512 in scientific notation

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

Which point on the x-axis lies on the line that passes through point c and is parallel to lino ab?

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.