Kylie has a modern quarter with a mass of 5.623g and an older silver quarter with a mass of 6.24g. what is the combined mass of the quarters?

The combined mass of the quarters is  11.863 g.

Step-by-step explanation:

1. You have the following information given in the problem above:

- The mass of the modern quarter is 5.623 g.

- The mass of the older silver quarter is 6.24 g.

2. Therefore, to calculate the combined mass of the quarters, you only need to add the mass of the modern quarter (5.623 g) and the mass of the older silver quarter is (6.24 g), as you can see below:

Let's  call the combined mass of the quarters . Then:

f is the midpoint of

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.