Can you please and comma's? Without commas everything is confusing.
Answer:
See explanation
Step-by-step explanation:
<u>Step 1.</u> Substitute for d to solve for n:
From the first equation:

Then substitute it into the second equation:

<u>Step 2:</u> Substitute for n to solve for d:

There are 40 dimes and 30 nikels in the piggy bank
Answer:
18.583
Step-by-step explanation:
I just did the math and checked my answer with a calculator
For both problems, we can use the section formula.
1) 
2) 
Answer: 10x+9=320 || if you’re looking for the missing number you have to solve for x so move the nine over 10x=320-9, 10x=311, x=31.1