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Degger [83]
3 years ago
12

B2 - 4ac > 0 means the root is real. True or False

Mathematics
2 answers:
dsp733 years ago
6 0
I'm pretty sure it's true.
attashe74 [19]3 years ago
5 0
This seems to be the dicriminant

when it is positive, that means it has 2 real roots

so the statement is true
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Why are you allowed to move the decimal points before dividing with decimals?
nadya68 [22]
It is because both the dividend and the divisor are multiplied by 10, 100, 1000, or some other power of ten.
7 0
3 years ago
Evaluate using the finite geometric sum formula
Sever21 [200]

Answer:

S_9=-18.703.

Step-by-step explanation:

The given series is,

\sum_{i=1}^9(-\frac{1}{2})^{i-1}

When we substitute i=1, we get the first term, which is a_1=-28(-\frac{1}{2})^{1-1}


This implies that,

a_1=-28(-\frac{1}{2})^{0}


a_1=-28(1)=-28.


The common ratio is

r=-\frac{1}{2}


The finite geometric sum is given by the formula,

S_n=\frac{a_1(r^n-1)}{r-1} , -1\:.


Since there are 9 terms, we find the sum of the first nine terms by putting n=9 in to the formula to get,


S_9=\frac{-28((-\frac{1}{2})^9-1)}{-\frac{1}{2}-1}.


S_9=\frac{-28((-\frac{1}{2})^9-1)}{-\frac{1}{2}-1}.


S_9=\frac{-28((-\frac{1}{512})-1)}{-\frac{3}{2}}.


S_9=\frac{-28(-\frac{513}{512})}{-\frac{3}{2}}.


S_9=-28(\frac{171}{256}).


S_9=-\frac{1197}{64}.



S_9=-18.703.


The correct answer is B





4 0
3 years ago
Read 2 more answers
What is the answer to this I need help please
VARVARA [1.3K]

Answer:

A an B

Step-by-step explanation:

The slope is 1/2 and the line is proportional

<u>*plsssssss make me brainlist*</u>

7 0
3 years ago
If your parallelogram has a base a 60 degrees what is your height
DENIUS [597]
I really don’t know I’m just tryna get answers bc I’m failing and stuff and I’m sorry but ima just eh
3 0
3 years ago
A cylinder is 20 inches long and has a diameter of 10 inches the approximate volume of the cylinder is_____ cubic centimeters
Lesechka [4]

Answer: 3987.8cm³

Step-by-step explanation:

Volume of a cylinder = πr²h

where

π = 3.14

r = diameter / 2 = 10in/2 = 5inches

h = height = 20in

Volume = πr²h

= 3.14 × 5² × 20

= 3.14 × 25 × 20

= 1570inches³

Since 1 inch = 2.54cm

1570 inch = (1570 × 2.54) = 3987.8cm³

Therefore, the volume of the cylinder is

3987.8cm³ cubic centimeters.

5 0
3 years ago
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