2. What is the difference between 25°c and _4°c? Choose one answer a 25-(-4) b.25-4. c.-4+(+25). 25+(-4) ​

A c is subtraction AND f is adding

Step-by-step explanation:

a(25-(-4))

Step-by-step explanation:

25 and -4 are in different sides of 0 mark on number line therefore when subtracting we take care of negative sign.

thanks

ok then what happened.

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.