PLZ HELP ME ON THIS IM SO CONFUSED and thank you.

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

Three times the sum of a number and seven is negative thirty-six. what is the number?

Aplot of land has been surveyed for a new housing development with borders ab, bc, dc, and da. the plot of land is a right trapezoid with a height of 60 feet and an opposite leg length of 65 feet