C is in scientific notation.
Step-by-step explanation:
Add 8n to both sides to get
8n-67 = 5
then add 67
8n = 5+67 = 72
divide by 8
n = 9
Answer:
a = 5
Step-by-step explanation:
3(a - 4) + 1 = 9 - a Distribute the 3 into a-4
3a - 12 + 1 = 9 - a Combine like terms
[-12 and 1]
3a - 11 = 9 - a Add 11 to both sides to isolate 3a
+11 +11
3a = 20 - a Add a to remove it and have all a
+a +a
4a = 20 Divide by 4 to only have a
/4 /4
a = 5
Ok, this is how I tackle these problems - 1) I evaluate what's happening in the problem. Chairs are being sold at a store on sale. 2) I write the problem out in stages as shown:
36 x .60 = 21.60 Calculate the markup of 60 percent.
36.00 + 21.60= 57.60 Add the markup to the original price.
57.60 x .20 = 11.52 Find the discount of 20 percent on the new price.
57.60 - 11.52 = 46.08 Subtract the discount from the new price.
46.08 x 2 = $92.16 Multiply the discounted price by 2 to find the price of 2 chairs.