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3 years ago

3x + 2 = 38 Please help me.

2 answers:

6 0

<span>Simplifying 3x + 2 = 38

Reorder the terms: 2 + 3x = 38

Solving 2 + 3x = 38

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-2' to each side of the equation.
2 + -2 + 3x = 38 + -2

Combine like terms: 2 + -2 = 0
0 + 3x = 38 + -2
3x = 38 + -2

Combine like terms: 38 + -2 = 36 3x = 36

Divide each side by '3'. x = 12

Simplifying x = 12

Answer = 12 </span>

aivan3 [116]3 years ago

3 0

Subtract 2 from both sides

simplify 38 - 2 to 36

divide both sides by 3

simplify 36/3 to 12

Answer: x = 12.

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What is the decibel level of the radio with intensity 10−7 watts per square inch? Use a logarithmic model to solve.

BaLLatris [955]

Answer:

$D = 50$

Step-by-step explanation:

Given

$I = 10^{-7}W/m^2$ --- Intensity

Required

Determine the decibel level (D)

This is calculated as:

$D = 10 * log(\frac{I}{I_n})$

Where:

$I_n =$ The threshold intensity

$I_n =1 * 10^{-12}W/m^2$

So, we have:

$D = 10 * log(\frac{I}{I_n})$

This gives:

$D = 10 * log(\frac{10^{-7}W/m^2}{1 * 10^{-12}W/m^2})$

$D = 10 * log(\frac{10^{-7}}{10^{-12}})$

Apply law of indices

$D = 10 * log(10^{-7--12})$

$D = 10 * log(10^{5})$

Apply law of logarithm

$loga^b = b\ log(a)$

So, we have:

$D = 10 * 5 * log(10)$

$log(10) =1$

So:

$D = 10 * 5 *1$

$D = 50$

<em>Hence, the decibel level is 50</em>

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3 years ago

If you first climb up 3 rungs then down 5 rungs and then up 10 rungs to get onto The top rung how many rungs are on the ladder?

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