10 is the answer.
You know that there are 4 numbers and you have to add the numbers then divide them by four to get the mean. So all you have to do is reverse the steps, multiply 30 by 4 to get 120, then add 12+50+48 to get 110. Then subtract, 120-110=10. To check if it is correct add 12, 50, 48, and 10 to get 120, then divide by 4 to get 30. And voila, there is the answer. I hope this helped for future problems like this one.
Tax: 52.5 x .08= 4.2
Tip: 52.5 x .20= 10.5
Total: 52.5+ 4.2+ 10.5= $67.10
Maria is correct because she subtracted the discount and added the sales tax...
The discount is the amount that would be taken away from the original price and the sales tax is added to the original price.
Yes, they have enough money.
(26.50-25%+10%=22.525)
Answer:
E) 79.7 cm^2
Step-by-step explanation:
This is really messy so I think the choices are A) to E) only
I think its 6cm 7.2cm 2.8cm 10cm
1. Multiply all
6 * 7.2 + 2.8 * 10 > 70
2. Around 79.7
The easiest place to start is with the answer. The 3 by 4 rectangle (upper right) is the answer. P = 2(L + W) = 2(4 + 3) = 2*7 is 14.
14 is less than 16.
Now lets find out why the others can't be true.
The upper left has an area of 12 (6*2). So the area is find.
P = 2 * (L + W) = 2* (6 + 2) = 16 This would support the conjecture so it is not the answer you want.
The lower left has an area of 12 and a perimeter of 2*(12 + 1) = 26. That supports the conjecture. So you don't want that one either.
The lower right does not have an area of 12. It cannot help us at all.
