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3 years ago

2k•squared• + 7 - 15 factoring ax•squared•+bx+c

Mathematics

1 answer:

Rainbow [258]3 years ago

6 0

Calculate Δ = b^2 -4ac => Δ = 169 => k1 = 3/2; k2 = -5 => 2k^2 + 7k - 15 = 2*(k -3/2)(k+5) = (2k - 3)(k+5);

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Geometric sequences HELP ASAP!

Pani-rosa [81]

Given:

The table for a geometric sequence.

To find:

The formula for the given sequence and the 10th term of the sequence.

Solution:

In the given geometric sequence, the first term is 1120 and the common ratio is:

$r=\dfrac{a_2}{a_1}$

$r=\dfrac{560}{1120}$

$r=0.5$

The nth term of a geometric sequence is:

$a_n=ar^{n-1}$

Where a is the first term and r is the common ratio.

Putting $a=1120, r=0.5$ , we get

$a_n=1120(0.5)^{n-1}$

Therefore, the required formula for the given sequence is $a_n=1120(0.5)^{n-1}$ .

We need to find the 10th term of the given sequence. So, substituting $n=10$ in the above formula.

$a_{10}=1120(0.5)^{10-1}$

$a_{10}=1120(0.5)^{9}$

$a_{10}=1120(0.001953125)$

$a_{10}=2.1875$

Therefore, the 10th term of the given sequence is 2.1875.

6 0

2 years ago

Pls help I’m begging u

OlgaM077 [116]

You're answer is the third one, you gotta divide the money by the hours worked and then compare.

3 0

3 years ago

755,082 rounded to the nearest 10,000

Tems11 [23]

760,000 is the answer

4 0

3 years ago

Read 2 more answers

Evaluate.<br><img src="https://tex.z-dn.net/?f=%20-%20%20%5Csqrt%7B81%7D%20" id="TexFormula1" title=" - \sqrt{81} " alt=" - \s

loris [4]

Answer:

Step-by-step explanation:

First find factors of 81

3 81

3 27

3 9

3 3

81 = 3×3×3×3

81 = 3^4

Taking squareroot

∴ -√81 = -√3^4

= -3^2

= -9

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2 years ago

PLEASE HELP ME WITH THESE :) FASTTTT

Vanyuwa [196]

Answer:

Step-by-step explanation:

1 :-4,4

2: 60

3:54.45

4:105

5:77

4 0

3 years ago

Read 2 more answers