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2 years ago

Use polynomial identities to multiply (5 - 4x3)(5 + 4x3). What identity did you use?

1 answer:

4 0

$\textit{difference of squares} \\\\ (a-b)(a+b) = a^2-b^2 \\\\[-0.35em] ~\dotfill\\\\ (5-4x^3)(5+4x^3)\implies [(5)^2-(4x^3)^2]\implies [(5^2)-(4^2x^{3\cdot 2})] \\\\[-0.35em] ~\dotfill\\\\ ~\hfill 25-16x^6~\hfill$

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Hello,

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2 years ago

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1 year ago

A ball of mass 0.4 kg flies through the air at low speed, so that air resistance is negligible. What is the net force acting on

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Answer:

-3.92 N

Step-by-step explanation:

We are given that

Mass of ball=0.4 kg

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We have to find the net force acting on the ball while it is in motion.

We know that when there is no air resistance then the net force acts on the ball is equal to weight of ball.

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2 years ago

A manufacturer of cell phone screens is concerned because 12 percent of the screens manufactured using a previous process were r

fomenos

Answer: A.

$H_0:p=0.12\\\\H_a:p$

Step-by-step explanation:

Null hypothesis $(H_0)$ : A statement describing population parameters as per the objective of the study. It usually takes "≤,≥,=" signs.

Alternative hypothesis $(H_a)$ : A statement describing population parameters as per the objective of the study. It usually takes ">, <, ≠" signs.

Let p be the proportion of screens that will be rejected.

12 percent of the screens manufactured using a previous process were rejected at the final inspection.

(i.e. p= 0.12)

Objective of the study = whether the new process<em> reduces </em>the population proportion of screens that will be rejected

i.e. p< 0.12

So, the appropriate hypotheses to investigate whether the new process reduces the population proportion of screens that will be rejected:

$H_0:p=0.12\\\\H_a:p$

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2 years ago

What’s the answer ?

svlad2 [7]

Answer:

Step-by-step explanation:

lining them up:

19, 19, 22, 25, 27, 31, 32, 32, 40

We can see that 27 is in the middle when h is 40

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2 years ago