Answer:
I think its 15 + 5x
Step-by-step explanation:
<span>4 hundreds 13 tens 5 ones = 400+13*10+5
= 400+130+5
= 535</span>
Answer: The required number of books that Ruben had before purchases is 50.
Step-by-step explanation: Given that Ruben bought 6 new books for his collection that increased his collection by 12%.
We are to find the number of books that Ruben had before purchases.
Let x denotes the number of books that Ruben had before purchases.
Then, according to the given information, we have

Thus, the required number of books that Ruben had before purchases is 50.
Answer:
d= -37
Step-by-step explanation:
subtract 21 on both sides which would be -16-21 and that would come to be d=-37
I would have 144 because you just times 4 and 36