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3 years ago

Which equations are true?

Mathematics

2 answers:

bija089 [108]3 years ago

8 0

Answer:

B is correct

Step-by-step explanation:

-(-x) = x, because a double negative like this equals a positive.

Therefore, you are actually saying -x+x= 0 which is true.

azamat3 years ago

3 0

Equation B. is true for all values of x.

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What is the median of 137 115 104 to 63 and 98

Romashka-Z-Leto [24]

Answer:

104

Step-by-step explanation:

put them from less to highest then find the middle number

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3 years ago

Michael took in 91 mile bike trip. he left home at 7 AM. If he stopped for a total of two hours for rest and food and averaged 1

Korvikt [17]

Distance = rate * time
t = d / r

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3 years ago

150=2x do the work out please

IrinaVladis [17]

Answer:

Let's solve the expression!

Step-by-step explanation:

$150 = 2x$

$\frac{150}{2}=\frac{2x}{2}$

$75 = x$

Your answer is 75.

The fraction shows 150 ÷ 2 and 2x ÷ 2.

I hope this helps!

<h2><u>PLEASE MARK BRAINLIEST!</u></h2>

7 0

3 years ago

Read 2 more answers

What is the answer to f-7/g= h for f

gtnhenbr [62]

Answer:

Step-by-step explanation:

$f - \frac{7}{g}=h\\\\f =h + \frac{7}{g}$

5 0

3 years ago

Using your knowledge of exponential and logarithmic functions and properties, what is the intensity of a fire alarm that has a s

Ierofanga [76]

Option B:

$I=1.0\times\ 10^{0} \ \text {watts}/ \text m^2}$

Solution:

Given sound level = 120 decibel

To find the intensity of a fire alarm:

$$\beta=10\log\left(\frac{I}{I_0} \right)$

where $I_0=1\times10^{-12}\ \text {watts}/ \text m^2}$

Step 1: First divide the decibel level by 10.

120 ÷ 10 = 12

Step 2: Use that value in the exponent of the ratio with base 10.

$10^{12}$

Step 3: Use that power of twelve to find the intensity in Watts per square meter.

$$10^{12}=\left(\frac{I}{I_0} \right)$

$$10^{12}=\left(\frac{I}{1\times10^{-12}\ \text {watts}/ \text m^2} \right)$

Now, do the cross multiplication,

$I=10^{12}\times1\times\ 10^{-12} \ \text {watts}/ \text m^2}$

$I=1\times\ 10^{12-12} \ \text {watts}/ \text m^2}$

$I=1\times\ 10^{0} \ \text {watts}/ \text m^2}$

$I=1.0\times\ 10^{0} \ \text {watts}/ \text m^2}$

Option B is the correct answer.

Hence $I=1.0\times\ 10^{0} \ \text {watts}/ \text m^2}$ .

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3 years ago