Combine like terms in the expression
3x+2+9x-7

12x-5

Step-by-step explanation:

3x and 9x are like terms, and so are 2 - 7. You can identify like terms as they most likely end the same. When you have your like terms identified, just add them like normal.

3x + 9x = 12x

2 - 7 = -5

12x-5

Step-by-step explanation:

3x+2+9x-7 = 12x-5

First, collect like terms which is 12x+2-7. Then, calculate the difference which is 12x-5.

none.

step-by-step explanation:

m

1

=

5

m1=5

b

=

−

1

b=-1

find the slope and y-intercept of the second equation.

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m

2

=

0

m2=0

b

=

−

6

b=-6

compare the slopes

m

m of the two equations.

m

1

=

5

,

m

2

=

0

m1=5,m2=0

compare the two slopes in the decimal form. if the slopes are equal, then the lines are parallel. if the slopes are not equal, then the lines are not parallel.

m

1

=

5

,

m

2

=

0

m1=5,m2=0

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: