A babysitter earns $9 an hour for babysitting 2 children. She is given an additional $2 tip if the children are put to bed on time. What expression could you use to determine how much the babysitter earned if both of the children were put to bed on time? A) 9x+2, where x is the number of hours B) 2x+9, where x is the number of hours C) x(9+2) + 2, where x is the number of children D) 2x + (9+2), where x is the number of children
A is the correct answer. X is the number of hours that the babysitter worked. Since the babysitter earns money at a rate of $9 per hour, she earned 9x dollars for the x hours worked. If the babysitter gets both children to bed on time, the babysitter earns a $2 tip. Therefore, the babysitter earned a total amount of 9x + 2 dollars.
You are given a solution of sucrose. How would you determine whether the solution was unsaturated, saturated or supersaturated?
Add a small crystal. If it dissolves, the solution was unsaturated. If it doesn't dissolve, the solution was saturated. If more than the crystal comes out of solution, then the solution was supersaturated.
Annie bought 8 notebooks and 4 pens costing 2 dollars each. How much did Annie pay?
Since both the notebooks and the pens cost $2 each, you can add the number of notebooks and pens together before multiplying. You would first add 8 and 4 together, which is 12. You then will multiply 12 by the cost of the individual products ($2). You will get 24 as your answer. So, Annie paid $24 for 8 notebooks and 4 pens. 2 × (8+4) = 2 × 8 + 2 × 4 = 16 + 8 = 24 dollars