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Svetllana [295]
3 years ago
12

A test of intelligence is given to a subject. The subject scores 110 on the first administration. Six months later, the same sub

ject is given the same test again and receives a score of 75. After another six months has passed, the subject is given the test one last time and receives a score of 138. What conclusions can be drawn from these scores?The scores are not valid.
Mathematics
1 answer:
Basile [38]3 years ago
5 0

Answer:

True, the scores are not valid.

Step-by-step explanation:

The test supposed to be measuring intelligence. We can assume that the intelligence of most people relatively stable (will not change too much over a short amount of time), and can expect it should go upward with brain growth and education. But the test seems to give a huge decrease from the first and second results. Then the third result is a huge increase that even higher than the first test.  

We don't know the true value of the subject, but seeing the huge gap for every repetition we can tell that the test result lacks precision.

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The sum of 5.75 and half a number is -5. What is the number? Please help!
barxatty [35]

Answer:

5.75 +  \frac{x}{2}  =  -  5 \\  \frac{x}{2}  =  - 5 - 5.75 \\  \frac{x}{2}  =  - 10.75 \\ x =  - 21.5

4 0
2 years ago
Can someone please explain how to do these?
Pani-rosa [81]

Answer:

<u>First question answer:</u> The limit is 69

<u>Second question answer:</u> The limit is 5


Step-by-step explanation:

For the first limit, plug in x=8 in the expression (9x-3), that's the answer for linear equations and limits.

So we have:

9x-3\\9(8)-3\\72-3\\69

The answer is 69


For the second limit, if we do same thing as the first, we will get division by 0. Also indeterminate form, 0 divided by 0. Thus we would think that the limit does not exist. But if we do some algebra, we can easily simplify it and thus plug in the value x=1 into the simplified expression to get the correct answer. Shown below:

\frac{x^2+8x-9}{x^2-1}\\\frac{(x+9)(x-1)}{(x-1)(x+1)}\\\frac{x+9}{x+1}

<em>Now putting 1 in x gives us the limit:</em>

\frac{x+9}{x+1}\\\frac{1+9}{1+1}=\frac{10}{2}=5

So the answer is 5

3 0
3 years ago
I really need help!If someone answers this,I will be happy to mark the brainest answer!EXTRA:you can answer the top question for
andreev551 [17]

9) They traveled 31.9 hours over the 3-day trip.

10.9 + 8.6 + 12.4 = 31.9

10) She does not have enough money. She has $12, but everything she wants to purchase would cost $12.39.

Large drink = 1.79

Turkey sandwich = 4.85

1.79 + 4.85 = 6.64

6.64 + 5.75 = 12.39

5 0
2 years ago
PLEASE HELP! it’s would be really appreciated
cluponka [151]

Answer:

46 degrees

Step-by-step explanation:

180 - 102 - 32 equals to 46

5 0
2 years ago
Convert the 55.68 feet swam by the sea horse to inches
saveliy_v [14]
464 inches. Hope this helped! :)
6 0
2 years ago
Read 2 more answers
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