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3 years ago

Expand and simplify (2x+1)(x+3)

Mathematics

1 answer:

MissTica3 years ago

7 0

Answer:

2x^2+7x+3

Step-by-step explanation:

(2x+1)(x+3)

2xx+2(3x+1)(x+1)(3)

2x^2+7x+3

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Is y^2=9x+1 a function

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Answer:

Slope:

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2 years ago

If b=6, find the value of 7b

Serggg [28]

7b is just 7 x b and if b is 6 its just 7 x 6
which the answer is 42

5 0

3 years ago

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Select all the inrational numbers from the list

snow_tiger [21]

B is one.

A < C and D are rational

Im thinking about E. It looks like a recurring decimal at first sight but I think its irrational.

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3 years ago

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Find the unknown side lengths in these right triangles.

ivolga24 [154]

Answer:

Triangle 1 - $\sqrt{29$ (if they want simplest radical form) or 5.4 (if they want to the nearest tenth)

Triangle 2- i couldnt figure this one out- may not be true

Pythagorean Theorem is... C) true for all right triangles

Step-by-step explanation:

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3 years ago

find the surface area of a right regular hexagonal pyramid with sides 3 cm and slant heights 6cm. show all of your work.

DedPeter [7]

Answer:

The surface area of right regular hexagonal pyramid = 82.222 cm³

Step-by-step explanation:

Given as , for regular hexagonal pyramid :

The of base side = 3 cm

The slant heights = 6 cm

Now ,

The surface area of right regular hexagonal pyramid = $\frac{3\sqrt{3}}{2}\times a^{2} + 3 a \sqrt{h^{2}+ 3\times \frac{a^{2}}{4}}$

Where a is the base side

And h is the slant height

So, The surface area of right regular hexagonal pyramid = $\frac{3\sqrt{3}}{2}\times 3^{2} + 3 \times 3 \sqrt{6^{2}+ 3\times \frac{3^{2}}{4}}$

Or, The surface area of right regular hexagonal pyramid = $\frac{3\sqrt{3}}{2}\times 9 + 9 \sqrt{36+ 3\times \frac{9}{4}}$

Or, The surface area of right regular hexagonal pyramid = 23.38 + 9 × $\frac{171}{4}$

∴ The surface area of right regular hexagonal pyramid = 23.38 + 9 × 6.538

I.e The surface area of right regular hexagonal pyramid = 23.38 + 58.842

So, The surface area of right regular hexagonal pyramid = 82.222 cm³ Answer

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3 years ago