Find the value of: a) x2, when x = 6
b) y, when y = -4
c) s2, when s = 8
d) d?, when d = -7
e) a2, when a = 0.2

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups