Barbara is converting 78°f to degrees celsius. first, she subtracts 32 from 78. what is the next step?
a.) multiply 46 by 5/9
b.) multiply 46 by 9/5
c.) add 273 to 46
d.) subtract 273 from 46

A.) Multiply 46 by 5/9

Step-by-step explanation:

The formula to convert Fahrenheit degrees to Celsius degrees is as follows:

So, converting 78°F to °C, according this previous equation is:

[Barbara subtracts 32 from 78]

 [Barbara multiplies 46 by 5/9]

or 25.56°C

A) multiply 46 by 5/9

Step-by-step explanation:

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.