Choose the possible number of solutions for hese equations x-3y=-3, -2x+6y=12

If you take the 2nd equation and divide each side by -2, you get x - 3 y = -6. That statement contradicts the first equation.

if you graph both equations you get two lines that are parallel. So the two original equations have no solution.

step-by-step explanation:

descending order means to order the polynomials from the term with the largest exponent to the term with the smallest exponent.  

therefore, the correct answer is d.  

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: