Brian invests £4700 into his bank account. He receives 5.5% per year compound interest.
How much will Brian have after 3 years?

5,548.9861375

Step-by-step explanation:

First year

4700/100×5.5=258.5

So his account will be 4700+285.5=4985.5

Second year

4985.5/100×5.5=274.2025

His account will be 4985.5+274.2025=5,259.7025

Third year

5,259.7025/100×5.5=289.2836375

The total in his account after three years equal to

289.2836375+5259.7025=5,548.9861375

a

step-by-step explanation:

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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.