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3 years ago

Im helping my little cousin do his math the yellow highlighted ones need to be checked. (NOT THE RED HIGHTAILED ONES)

Mathematics

2 answers:

cupoosta [38]3 years ago

4 0

Answer:

Step-by-step explanation:

I think they are right

leva [86]3 years ago

3 0

Yeah I believe it everything is right

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Thi sis the question

jek_recluse [69]

$\text{Given that,}\\\\x^2 + \dfrac1{x^2} = 38\\\\\\(i)\\\\\left(x-\dfrac 1x \right)^2 = x^2 + \dfrac 1{x^2} - 2 \cdot x \cdot \dfrac 1x\\\\\\\implies \left(x-\dfrac 1x \right)^2 = 38 -2 = 36\\\\\implies x - \dfrac 1x = \pm\sqrt{36} = \pm 6 \\\\\\(ii)\\\\x^2 + \dfrac 1{x^2} = 38\\\\\\\implies \left(x^2 + \dfrac 1{x^2} \right)^2 = 38^2\\\\\\\implies x^4 + \dfrac 1{x^4} + 2\cdot x^2 \cdot \dfrac 1{x^2} = 1444\\\\\\\implies x^4 + \dfrac 1{x^4} + 2 = 1444\\\\\\$

$\implies x^4 +\dfrac 1{x^4} = 1444-2 = 1442$

7 0

2 years ago

The number of birds in a forest is decreasing by 3% every

AlexFokin [52]

Answer:

4266

Step-by-step explanation:

Okay! let's start with finding what 3% of 5400 birds is

3% is .03 as a decimal. We can find 3% of 5400 by multiplying 5400 by .03

5400×.03= 162

If our rainforest is losing 3% a year, that means we are losing 162 birds a year.

Let's turn it into an equation! x will be the number of years

5400-162x= number of birds left after x years

Now put 7 in for x

5400-(162×7)= 4266 birds

Hope this helps!

AbbyMay :)

7 0

3 years ago

20 is what percent more than 5 ?

ziro4ka [17]

5 can go into 20 4 times. If 5 was already there then it is 400 times the original number or 5.
OR
5/100 = 20/x Rearrange x5 = 20x100 2000/5 = x x=400

5 0

4 years ago

For breakfast, Clarissa can choose from oatmeal, cereal, French toast, or scrambled eggs. She thinks that if she selects a break

makvit [3.9K]

Clarissa is not correct. If she were to choose one from the stack at random, it means that she has a 25%, or a 1/4 chance to pick the oatmeal, just like the other breakfast items.

If there were to be more oatmeals than any of the other items, it will heighten the chance of her getting oatmeal which would be the only way to make her statement correct.

5 0

3 years ago

1. The video store rented 42 videotapes on

Dvinal [7]

Answer:

C. 40

Step-by-step explanation:

average = (42 + 35 + 51 + 32)/4 = 40

Answer: C. 40

6 0

3 years ago

Read 2 more answers