A^2 + b^2 = c^2
9^2 + b^2 = 12^2
81 +b^2 = 144
-81 (subtract 81 from both sides of the equation)
b^2 = 63
b = square root of 63
Answer:
-4 and 5
Step-by-step explanation:
The time it will take Jack and Chris to program the app when they work together is 4.24 hours.
<h3>What is a rate?</h3>
Rate is a ratio that compares two different quantities which have different units.
Jack program an app in 9 hours. Therefore, the rate is as follows;
1 / 9
Chris can program the same app in 8 hours. Therefore, the rate is as follows;
1 / 8
When they do it together.
1 / 9 + 1 / 8 = 8 + 9/ 72 = 17 / 72
1 / t = 17 / 72
cross multiply
72 = 17 t
t = 72 / 17
t = 4.23529411765
t = 4.24
Therefore, the time it takes for both of them is 4.24 hours.
learn more on rate here: brainly.com/question/23895068?referrer=searchResults
#SPJ1
Answer:
A
Step-by-step explanation:
It's just a normal quadratic graph but flipped meaning its just negative x squared
