804.24 - we know this because the area of a circle is r^2*pi. If we double the radius we get (2r)^2*pi or 4r^2*pi. We notice that this is just 4 times the area of the original circle, equating to 804.24.
(x+b/2a)^2-(b^2-4ac)/2a=0
Step 2:
Re-write the expression:
(x+b/2a)^2=(b^2-4ac)/4a^2
Step 3:
get the square root of both sides:
x+b/2a=sqrt[(b^2-4ac)/4a^2]
Step 4:
Simplifying we get:
x+b/2a=sqrt[b^2-4ac]/2a
Step 5
Make x the subject:
x=-b/2a+/-sqrt[b^2-4ac]/2a
Answer:
259 students
Step-by-step explanation:
First, find how many will check out science fiction books
350(0.14)
= 49
Find how many will check out sports books
350(0.12)
= 42
Subtract these amounts from 350
350 - 49 - 42
= 259
So, she should expect 259 students not to check out science fiction and sports books
Answer:
22.62
Step-by-step explanation:
Cos=12/13
12/13= 0.9231
Cos^-1(0.9231)=22.62