Chad has a coin collection. He has 21 coins in all. He has 4 times as many pennies as nickels. He has 1 more dime than the number of nickels. He has 1 less quarter than the number of nickels. How many of each coin does he have?

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

Which statement explains how you could use coordinate geometry to prove that quadrilateral abcd is a parallelogram? -5 -4 -3 -2 -1 t 1 2 3 4 prove that all sides are congruent and have slopes that are opposite reciprocals prove that segments ad and ab are congruent and parallel prove that opposite sides are congruent and have equal slopes prove that segments bc and cd are congruent and parallel

Use the graph of the sine function y=2sinθ shown below