Which expression represents each mathematical phrase? drag the answer into the box to match each phrase. the product of 7 and a number the sum of 7 and a number 7 less than a number 7 more than twice a number 2+x+7 7+x 2x+7 x−7 7x 7−x

1. e 7x

2. b 7+x

3. f 7-x

4. c 2x+7

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The product of 7 and a number=7x The sum of 7 and a number=7+x 7 less than a number=x-7 7 more than twice a number=2x+7

Step-by-step explanation:

I took the test online in K12 and when I reviewed it it said that those are the correct answers. Have a nice day!

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.