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2 years ago

Plase help me thanks you!

Mathematics

2 answers:

Stells [14]2 years ago

7 0

$11.70 would be your answer

sasho [114]2 years ago

3 0

$12 x .30= $3.60 mark up so new price was $15.60.

$15.60 x .25= $3.90 discount, so the new price with discount would be $11.70

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Prove that an = 4^n + 2(-1)^nis the solution to

olga nikolaevna [1]

Answer:

See proof below

Step-by-step explanation:

We have to verify that if we substitute $a_n=4^n+2(-1)^n$ in the equation $a_n=3a_{n-1}+4a_{n-2}$ the equality is true.

Let's substitute first in the right hand side:

$3a_{n-1}+4a_{n-2}=3(4^{n-1}+2(-1)^{n-1})+4(4^{n-2}+2(-1)^{n-2})$

Now we use the distributive laws. Also, note that $(-1)^{n-1}=\frac{1}{-1}(-1)^n=(-1)(-1)^{n}$ (this also works when the power is n-2).

$=3(4^{n-1})+6(-1)^{n-1}+4(4^{n-2})+8(-1)^{n-2}$

$=3(4^{n-1})+(-1)(6)(-1)^{n}+4^{n-1}+(-1)^2(8)(-1)^{n}$

$=4(4^{n-1})-6(-1)^{n}+8(-1)^{n}=4^n+2(-1)^n=a_n$

then the sequence solves the recurrence relation.

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3 years ago

What is the product of 1/2 x -1/4 and 5x^2 - 2x + 6? Write in standard form.

geniusboy [140]

Answer: the product of the first one is (x-2)/(2)

Step-by-step explanation:

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3 years ago

Evaluate 6+ the sq root of 14+x minus - the sq root of 9x when x=2

romanna [79]

Hello
let : f(x) = 6 + √(14+x) - <span>√(9x)
f(2) = </span>6 + √(14+2) - √(9×2)
f(2) = 6 + √(16)-√(18)
f(2) = 6 + 4 - √(18) = 10 - √(18)

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3 years ago

BASED ON THE GRAPH, WHICH STATEMENT IS CORRECT?

abruzzese [7]

Answer:

i would go for a but im not really sure. sorry if incorrect

Step-by-step explanation:

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3 years ago

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blagie [28]

Answer:

B) n ≥ -20

Step-by-step explanation:

n/4 ≥ -5

n ≥ -20

7 0

2 years ago