3 years ago

Solve these problems not give tips solve

Mathematics

2 answers:

zubka84 [21]3 years ago

6 0

7. 2(3x-5) + 2(x+6)

8. 6x^2-8x+1 - (2x^2-5+2x^2-3x+4)

9. 5x^2+4

Norma-Jean [14]3 years ago

5 0

The correct answer is "please"

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At noon, a tank contained 10 cm of water. after several hours, it contained 7 cm of water. what is the percent decrease of water

andrey2020 [161]

Amount of decreased water = 3/10

Then, it would be 3/10 * 100 = 30%

So, your answer is 30%

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3 years ago

A plane flies from San Francisco to New York City at 600 miles per hour and returns along the same route at 400 miles per hour.

ozzi

Answer: 500 i think

Step-by-step explanation:

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3 years ago

What is the length of PR

BartSMP [9]

Answer:

B 7

Step-by-step explanation:

Since the triangles are similar by AAA

We can use ratios to find the length x (which is PR)

5 15

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4 years ago

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My grandparents have four grandchildren. The product of the ages of the four grandchildren is 67 184. The youngest grandchild is

fomenos

Answer:

lets say they are a,b,c,d

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also bear in mind that b and c are in between

the rest is just trial and error as long as you satisfy all those equations above

Step-by-step explanation:

8 0

3 years ago

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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