What is the sum of −3x+6 and 7x−8?

Your sum will be "4x−2".

Step-by-step explanation: To add these polynomials,

we simply add (-3x + 6) + (7x - 8).

Notice that I used parenthses around the polynomials.

This is a good habit to get into even though

the parenthses will not affect the addition.

Next, we simply add the like terms.

-3x + 7x is 4x and 6 + -8 is -2 so we have 4x + -2 or 4x - 2.

x

step-by-step explanation:

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.