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4 years ago

F (x) = -3x+5x^2+8 has blank roots.

Mathematics

1 answer:

defon4 years ago

7 0

Answer:

F (x) = -3x+5x^2+8 has complex roots.

Step-by-step explanation:

number of roots?

ok.

f(x) = 5xx - 3x + 8 = 5xx + 5x - 8x + 8 ( I was guessing what numbers would sum to -3)

nope.

ok try discriminant: (-3)^2 - 4*5 * 8 = 9 - 160 < 0

2 complex roots

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four out of 9 performers will be chosen to stand in a row on stage. how many ways can the 4 performers stand in a row

Zinaida [17]

The order matters.

$k$ objects can be chosen out of $n$ objects, when the order matters, in $P(n,k)=\dfrac{n!}{(n-k)!}$ ways.

So, the answer is $P(9,4)=\dfrac{9!}{5!}=6\cdot7\cdot8\cdot9=3024$ ways.

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3 years ago

Timmy takes out a loan for $750 for 15 months, but only receives $725 into his bank account. What is the simple interest rate ad

12345 [234]

Answer:

<u>The annual interest rate advertised by the bank is 2.67% or 0.22% per month.</u>

Step-by-step explanation:

Let's evaluate the information given:

Amount of the loan = US$ 750

Duration of the loan = 15 months

Net amount received by Timmy into his bank account = US$ 725

Interests for the loan = Amount of the loan - Net amount received into bank account

Interests for the loan = 750 - 725

Interests for the loan = US$ 25

Now for calculating the interest rate, we do this operation:

Interest rate = Interests for the loan / Amount of the loan

Interest rate = 25/750 = 1/30 = 0.033 * 100 = 3.3%

But let's remember that this is for the total duration of the loan, 15 months. For calculating the annual interest rate, we do the following operation:

Annual interest rate = Loan interest rate/15 * 12 (We use 12 because the year has 12 months)

Annual interest rate = (1/30) /15 * 12

Annual interest rate = (1/30) * 1/15 * 12 = 1/450 * 12 = 12/450 = 4/150 = 2/75 = 0.0267 * 100 = 2.67% (Rounding to two decimals)

<u>The annual interest rate advertised by the bank is 2.67% or 0.22% per month.</u>

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4 years ago

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Step-by-step explanation:

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3 years ago

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Explain how this method is correct...2 times 3 is 6, and 6 times 5 is 30.

ikadub [295]

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Step-by-step explanation:

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3 years ago

What is 0.7 repeating as a mixed number

nekit [7.7K]

The decimal number 0.7 repeating as a mixed number is 0.7777777.....

<h3>How to determine what is 0.7 repeating as a mixed number?</h3>

The decimal number is given as:

Number = 0.7

Express as fraction

Number = 7/10

Subtract 1 from the denominator

Number = 7/9

Convert to decimal

Number = 0.7777777.....

Hence, 0.7 repeating as a mixed number is 0.7777777.....

Read more about non-terminating decimals at:

brainly.com/question/19951720

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2 years ago