A side of the triangle below has been extended to form an exterior angle of 156°. Find the value of x.

How many solutions does the nonlinear system of equations graphed below have?

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4