MATHEMATICS HIGH SCHOOL

Choose the correct product of (5x + 4)2.25x2 + 40x + 16

25x2 − 16

25x2 + 16

25x2 − 40x + 16

Answers

Answer 1
Answer:

Answer:

25x^2 + 40x + 16

Step-by-step explanation:

(5x + 4)^2

= (5x + 4)*(5x + 4)

= 25x^2 + 20x + 20x + 16

= 25x^2 + 40x + 16
Answer 2
Answer:

The answer is, in fact, A. I took the test and the answer was correct.

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The times of all 15 year olds who run a certain race are approximately normally distributed with a given mean Mu = 18 sec and standard deviation Sigma = 1. 2 sec. What percentage of the runners have times less than 14. 4 sec?.

Answers

Question

The times of all 15 year old who run a certain race are approximately normally distributed with a given mean Mu = 18 sec and standard deviation Sigma = 1. 2 sec. What percentage of the runners have times less than 14. 4 sec?.

Answer:  

A.  0.15%  

Step-by-step explanation:  

The times of all 15 year old who run a certain race are approximately normally distributed with a given mean as 18 sec and standard deviation as 1.2 sec.  

We know that,  

where,  

X = raw score = 14.4  

μ = mean = 18  

σ = standard deviation = 1.2  

Putting the values,  

Finding the the probability from z score table, we get  

Answer:

a

Step-by-step explanation:

What best describe the relationship between 1 and 2​

Answers

Answer:

I think your correct

Step-by-step explanation:

the answer you picked looks like an image on my notes

sorry if its not

An investment club invested part of $8000 at 10% annual interest the rest at 12%. If the annual income from these investments is $900, how much was invested at each rate

Answers

let x be the amount invested  at 10%
so the amount invested at 12 % =  (8000-x)
   0.1x + 0.12(8000-x) = 900
   0.1x - 0.12x = 900- 960
   0.02x = 60
     x   =  3000      @ 10%
              8000 - 3000    =    5000     @ 12%

Joe, Keitaro, and Luis play tennis. To decide who will play against each other in the first match, they put their names in a hat and choose two names without looking.What subset, A, represents the complement of the event in which Joe plays in the first match?


A = {KL}

A = {KJ, KL}

A = {KL, LK}

A = {KJ, KL, LJ}

Answers

Answer:  First Option is correct.

Step-by-step explanation:

Since we have given that

There are three person : Joe, Keitaro, Luis.

And two names will be selected for he game .

Possible events will be

\{JK,JL,KL\}

But we want to find the complement of the event in which Joe plays in hte first match,

As we know that complement of any events means eliminate that event from the universal set.

Event of getting Joe plays in the first match is given by

\{JK,JL\}

So, complement of this event that Joe plays in the first match is given by

\{KL\}

so, First Option is correct.
The possible events are:

{JK, JL, KL}

The events where J does not play (the first game) are: {KL}

Answer: A = {KL}

rob owns 6 green t-shirts and 15 t-shirts in other colors. if rob randomly selects a t-shirt to wear, what is the probability it will be green?

Answers

The probability that Rob will randomly select a green t-shirt, given that he has 6 green and 15 of other colors, is 2/7.

Answer:

2/7

Step-by-step explanation:

P (probability) = number of successful events / number of all events

P = 6 / (6+15) = 6 / 21 = 2 / 7

Use implicit differentiation to find dy/dx. xy+5tan⁻¹(y)=7

Answers

i wrote the answer you can check
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