Find the value of this expression if x = -7.
x2 - 1

You put the following items into your rucksack. ham 600 g cheese 380 g tomatoes 270 g how much do all the ingredients weigh in total?

Complete the standard form of the equation that represents the quadratic relationship displayed above, where a, b, and c are rational numbers.

In need of in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.