Answer:
Step-by-step explanation:
First method: for (x+3)^2 if you multiply (x+3)(x+3) you get x^2+6x+9 which doesn't equal x^2+9
Second way: plug in a variable for example (2+3)^2= 25 and 2^2+9=13 so 13 doesn't equal 25
Answer:
Area=![\frac{13(6)}{2}](https://tex.z-dn.net/?f=%5Cfrac%7B13%286%29%7D%7B2%7D)
=![\frac{78}{2}](https://tex.z-dn.net/?f=%5Cfrac%7B78%7D%7B2%7D)
=39
Step-by-step explanation:
Hello!
You run 5 miles a hour
To find how far you go in half an hour you divide the distance by 2
5 / 2 = 2.5
To find how far you go in 2 1/2 hours you multiply the distance by 2.5
5 * 2.5 = 12.5
The answers are 2.5 miles in half an hour and 12.5 miles in 2 1/2 hours
Hope this helps!
Answer:
120 cm
Step-by-step explanation:
If you rearrange the lines you will get a rectangle whose sides are 25 cm and 35 cm.
To get a triangle, move the lines inside the rectangle keeping them parallel to the lines in front of them.
Let P the perimeter of the rectangle:
P = 25*2 + 35*2 = 50+70 = 120 cm
The weight of the hamburger is 160g after two bites.
Each bite takes away 20% of the weight of the burger, so we'll divide the initial weight by a percentage to find the weight before the bite.
The starting weight is 160g. Because 20% of the weight was removed from a bite, we'll divide this weight by the percentage of the burger remaining after the bite:
![100 - 20 = 80](https://tex.z-dn.net/?f=100%20-%2020%20%3D%2080)
80% of the burger is left after a bite. Convert this fraction into a decimal by dividing by 100:
![80 \div 100 = 0.8](https://tex.z-dn.net/?f=80%20%5Cdiv%20100%20%3D%200.8)
Divide the initial weight by this decimal:
![160 \div 0.8 = 200](https://tex.z-dn.net/?f=160%20%5Cdiv%200.8%20%3D%20200)
The weight of the burger before the second bite was 200.
We'll do the same procedure for the first bite. The initial weight is 200, and there is 80% of the burger remaining after the first bite. Because 80% is 0.8 in decimal form, divide 200 by 0.8:
![200 \div 0.8 = 250](https://tex.z-dn.net/?f=200%20%5Cdiv%200.8%20%3D%20250)
The starting weight of the burger before the bites was
250 grams.