Justin case has four times as many dimes as he has nickels in his pocket. If the total value of the change is $2.70 how many of each coin does he have? ( HELP PLEASE)

Simplify the expression. -2/5(10+15m-20n)

In the diagram, the ratios of two pairs of corresponding sides are equal to prove that almn - axyz by the sas similarity theorem, it also needs to be shown that x 6 z un z zz un = 2x zləzz lezy

Ibeg you to me 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?