Let Karen works x hours baby sitting
So, she worked (18-x) hours giving music lessons
So,
According to question
5x + 12(18-x)=139
This gives
7*x=77
x=11
So,
<span>Karen worked <em>11 hours baby sitting </em>and (18-11)=7 hours giving music lessons</span>
Yes it is (10x-y)^2 is the answer of it
All of the above. it is a three dimensional pyramid, and a "polyhedron" means it is triangular.
3x+2y=5.44
it's a two variable problem which can't be solved algebraically unless you are given the weight of one of the balls.
45
1080 divided by 24
45
45 5lbs per hour
