Solve with substitution
y=10+x
2x+y=4

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

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.

Evaluate the expression. (9 + 5)(3 + 2)0