Answer:
k= -5
Step-by-step explanation:
When x=1 and y= -2,
x-2y+k=0
1 -2(-2)+ k=0
1+4+k=0
5+k=0
k= -5
Here's what I got for the first question.
Did you want answers for the second one? I couldn't read that part of the image very well, if you did.
The approximate surface area of the balloon is 199 cm².
The approximate volume of the balloon is 262 cm³
<h3>What is the surface area and the volume of the balloon? </h3>
Radius of the balloon = circumference / 6.2832
25 / 6.2832 = 3.98cm
Surface area = 4πr²
4 x 22/7 x 3.97² = 199 cm²
Volume = 4/3πr³
4/3 x 22/7 x 3.97³ = 262.20 cm³
To learn more about the volume of a sphere, please check: brainly.com/question/13705125
Answer:
4.443*10^9
Step-by-step explanation:
pls heart and give brainliest much appreciated
<h3>
Answer: 2.4 pounds per dollar</h3>
Explanation:
We can set up the ratio
12 pounds : 5 dollars
Then divide both parts of that ratio by 5 so that the "5 dollars" becomes "1 dollar"
The ratio 12 pounds : 5 dollars is equivalent to 2.4 pounds : 1 dollar
