<span>John and his friends are going out for pizza for lunch. They split one pizza and 3 drinks. The pizza cost $12.00. They spent a total of $16.95. Find the cost of one large drink. --pizza=P-- --drinks=D-- --john and his friends=J-- they split one pizza and 3 drinks... (J=P+3D) the pizza cost $12.00... (P=$12) since you know the value of P you plug it in... (J=$12+3D) they spent a total of $16.95... J=$16.95 since you know the value of J you plug it in... $16.95=$12+3D and since you have only one unknown variable you can now solve by subtracting $12 on both sides... $4.95=3D then you divide 3 on both sides to keep the variable by itself... $1.65=1D and you end finding the cost of one drink 1D=$1.65 (D=$1.65)
<span>D. r + (-r) = 0 </span> The additive inverse<span> of a number a is the number that, when added to a, yields zero. This number is also known as the opposite.</span>
