Solve x/5 - x/2 =21. what is the value of x? a.-70 b.-7 c.7 d.70

We need a common denominator to subtract. Easiest way to do this is to find the LCM for both denominators. The number 10 will work since both 5 and 2 are multiples of 10 and 10 is LCM is 10 and 2.

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Subtract normally.

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Multiply each side by 10

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Divide both sides by -3

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x = -70

The correct answer is A.

she gotta workk that a 2

step-by-step explanation:

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is: