Answer:
-4
Step-by-step explanation:
3(5-n)=27
solve
15-3n=27
subtract 15 from 2 sides
-3n=12
n=-4
Assuming she did a checkered pattern if she got 10 red tiles she would need 20 tiles total if the kitchen was a square.
There seems to be some sort of missing information here or maybe a missing picture. Either way, I hope this helps.
Answer:
a. 
b.

c. For David to achieve three hundred dollars, he would have to save approximately 5 months
Step-by-step explanation:
A. David requires three hundred dollars, this is his goal, indicating the three hundred must be alone. For the inequality sign, the statement says that he "requires at least $300", meaning that he would have to maintain three hundred dollars or his amount could go greater than $300. Therefore, the inequality sign should be "≥" or "greater than or equal to". We also know that David can save 63 dollars per month, meaning that there should be a variable next to 63 so we could replace "x" with any number to solve our inequality. This should leave us with the following inequality :
63x ≥ 300
B. To solve the inequality, we need to get x alone, to do so, divide 63 by both sides,


To make it easier, we can round "4.76" to 5.

C. Already shown in the answer spot
You can round 790 to 800, and 9 to 10. So then it become 800/10, or 80. Your answer would be around 80. Hope I helped!
Well 51 per hour and there is 24 hours so you just multiply the two together. Which you would get get 1,224 Miles