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2 years ago

15 masons can renovate a hall in 20 days. How many masons will renovate the hall in 12 days?.

Mathematics

1 answer:

Nastasia [14]2 years ago

5 0

Answer:

Step-by-step explanation:

Use rule of three

15 => 20

x => 12

$x=\frac{12*15}{20}$

x = 9

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3 years ago

Which quadratic equation is equivalent to (x+2)^2+5(x+2)-6=0

Elis [28]

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3 years ago

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3 years ago

Xby the power of 5 times y to the power of 6 over 2 by the power of -2 times xby the power of 0times x by the power of 9

mars1129 [50]

Answer:

We have the sentence:

"X by the power of 5 times y to the power of 6 over 2 by the power of -2 times x by the power of 0times x by the power of 9"

Let's break it into parts.

"X by the power of 5 times y to the power of 6..."

This can be written as:

x^5*y^6

"... 2 by the power of -2 times x by the power of 0times x by the power of 9"

This can be written as:

2^(-2)*x^(0)*x^(9)

And we have the quotient between the first thing and the second thing, then the equation is:

$\frac{x^5*y^6}{2^{-2}*x^0*x^9}$

And any number by the power of 0 is equal to 1, then:

x^0 = 1, then we can rewrite the equation as:

$\frac{x^5*y^6}{2^{-2}*x^9}$

We can keep simplifying this.

We know that:

a^(-n) = (1/a)^(n)

Then:

2^(-2) = (1/2)^2 = 1/4

Then we get:

$\frac{x^5*y^6}{2^{-2}*x^9} = \frac{x^5*y^6}{x^9}*4$

And we also know that:

a^n/a^m = a^(n - m)

Then:

$\frac{x^5*y^6}{x^9}*4 = 4*y^6*\frac{x^5}{x^9} = 4*y^6*x^{5 - 9} = 4*y^6*x^{-4} = \frac{4*y^6}{x^4}$

And we can't simplify this anymore.

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2 years ago

9.The following set represents a set of rational numbers: {12.6,11/15,___,0} which could be the missing value in the set?

scoray [572]

Answer:

$\sqrt {196}$

Step-by-step explanation:

$\bigg \{ - 12.6, \: \frac{11}{15}, \: \red{ \boxed{\sqrt{196} }}, \: \: 0 \bigg\}$

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3 years ago