Rounding me to the nearest hundred makes me 900. the sum of my digits is 25. if you read forward or backward, i am still same. what number am i?

the no must be 858 o 868 or 878 or 888 or 898

8+5+8=21

8+6+8=22

8+7+8=23

8+8+8=24

8+9+8=25

now 898 is the most likely case here

lets go deep into it

approximating 898 to nearest hundred gives 900

addition of each character of 898 gives 25

reading forward and backward both 898 remains same

therefore 898 is the number which satisfies the given conditions. therefore the answer is 898

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.

overpriced

step-by-step explanation: