A bag contains yellow marbles and red marbles, 47 in total. The number of yellow marbles is 7 less than 5 times the number of red marbles. How many yellow marbles are there?

go on the tube you might find some information there

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)