Isabel and Ruth scored a total of twenty-two points in their last basketball game scored two more points than Isabelle. How many points did Isabel score? A:2x-2=22; x=12
B:x+2=22; x=20
C:2x+2=22; x=10
D:2x+2=22; x=12

isabel is represented as x

ruth is represented as x+2

so the equation would be

x+(x+2)=22

the (x+2) is ruth. so to check if its right solve it. 2x+2=22

-2 -2

2x+20

__ ___

2 2

x=10

so now you know that isabel scored 10 goals since she was x. to figure out ruth just add 2.

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"