Use the left and right triangles. (the two smaller ones -- ACD and BCD)
By similar triangles ACD is similar to BCD
on the left AD/CD is one ratio
On the right CD/DB is the other. These two ratios are equal because they are corresponding parts.
AD / CD = CD / DB
AD = 3
DB = 12
CD = ??
Substitute.
3/CD = CD/12 Cross multiply
36 = CD^2
sqrt(36) = sqrt(CD^2)
CD = 6 <<<<==== Answer.
A <<<<====Answer.
Answer:
No real solutions.
Step-by-step explanation:
Let's solve your equation step-by-step.
11x2−5x+2=0
For this equation: a=11, b=-5, c=2
11x2+−5x+2=0
Step 1: Use quadratic formula with a=11, b=-5, c=2.
x=
−b±√b2−4ac
2a
x=
−(−5)±√(−5)2−4(11)(2)
2(11)
x=
5±√−63
22
Answer:
120
Step-by-step explanation:
We can break it up and then solve. 15*2 is 30. 30*4 is 120.
Answer:
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Step-by-step explanation:
figure it out
Answer:
Hello your question is incomplete attached below is the complete question
answer : 1596 ± 2.861 
------ ( A )
Step-by-step explanation:
I will use excel function to resolve this question
<u>Determine the 99% confidence of interval for the difference in mean number of steps by all people</u>
∝ = 0.01
critical value ( t ) = 2.861 ( = TINV ( 0.01, 19 )
Given that :
S1 = 1580
S2 = 2350
n1 = 20
n2 = 20
Difference in mean = x1 - x2 = 1596
Margin of Error = t * 
∴ 99% confidence of interval
= 1596 ± 2.861 ------
