Three consecutive even numbers add to 42. What is the middle number?

What property of arithmetic is demonstrated here?

If 5 + x is 5 more than 5,what is the value of 2_x_?

Give the lines y = 0.5x+3 and y=3x-2. What is the y value of the point of intersection?

Pets Plus makes bird houses. Their monthly fixed expenses are $750. The cost for each bird house is $15. The bird houses sell for $40.

If Pets Plus sells 50 bird houses, what is the profit?

The Widget Company makes widgets. The monthly fixed costs are $750. It costs $45 to make each widget. The widgets sells for $75 a piece.

The Widget Company wants to make a profit of $3,000. How many widgets must be sold?

Ben is walking three dogs that weigh an average of 75 pounds each. Ben begins to walk a fourth dog, and the average weight of the dogs decreases to 70 pounds. What is the weight in pounds of the fourth dog?

The sum of two consecutive positive even integers is two greater than one-tenth of the product of the two integers. What is the sum of the positive factors of the smaller integer?

What number decreased by 7 is equal to 10 increased by 7?

If is defined for all numbers and to be , then what is ?