Which equation models the problem and shows the correct solution? The difference between x and 89 is 7. Write the equation as 89 minus x = 7 and subtract 7 from both sides. The answer is 82. Write the equation as x minus 89 = 7 and add 89 to both sides. The answer is 96. Write the equation as x minus 7 = 89 and add 7 to both sides. The answer is 96. Write the equation as 7 minus x = 89 and subtract 7 from both sides. The answer is 82.

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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.

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0