a China platter cost $550 during an auction the platter was sold for $820 what was the price increase in the cost of the platter​

Add 1/7 + -1/7 your answer should be reduced to its smallest form and should not be an improper fraction

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove