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3 years ago

Use PEMDAS to evaluate the expression 8 x 4 − 21 ÷ 3 + 5. 30 32 34 36

Mathematics

2 answers:

Dennis_Churaev [7]3 years ago

8 0

Answer:

its 30 i took the test

Step-by-step explanation:

VikaD [51]3 years ago

4 0

the answer should be 30

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What is the following simplified product? Assume x greater-than-or-equal-to 0

nlexa [21]

Answer:

$10x^4\sqrt{6}+x^3\sqrt{30x}-10x^4\sqrt{3}-x^3\sqrt{15x}$

Step-by-step explanation:

Remove perfect squares from under the radicals.

$(\sqrt{10x^4}-x\sqrt{5x^2})(2\sqrt{15x^4}+\sqrt{3x^3})\\\\=(\sqrt{10x^4})(2\sqrt{15x^4}) +(\sqrt{10x^4})(\sqrt{3x^3}) -(x\sqrt{5x^2})(2\sqrt{15x^4}) -(x\sqrt{5x^2})(\sqrt{3x^3})\\\\=2\sqrt{150x^8}+\sqrt{30x^7}-2x\sqrt{75x^6}-x\sqrt{15x^5}\\\\=\boxed{10x^4\sqrt{6}+x^3\sqrt{30x}-10x^4\sqrt{3}-x^3\sqrt{15x}}$

_____

The applicable rules of exponents are ...

(x^a)(x^b) = x^(a+b)

√(a^2) = a . . . . . . . for a > 0

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3 years ago

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V125BC [204]

I think the answer is b

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3 years ago

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156

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2 years ago

A mapping diagram showing a relation, using arrows, between input and output for the following ordered pairs: (negative 3, negat

il63 [147K]

Answer:

{x | x = –5, –3, 1, 2, 6}

Step-by-step explanation:

The domain is the list of first-values of the ordered pairs:

{x | x = –5, –3, 1, 2, 6}

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3 years ago

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Answer:

The surface area is multiplied by 3.

Step-by-step explanation:

If r is the radius of a sphere its surface area = 4(pi)r^2. If the radius is doubled then its surface area = 4(pi)(2r)^2 = 4*4(pi)r^2. So the surface area becomes 4-fold or the increase in surface area is 300%.

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4 years ago