Penny used 2/5 lb of flour to bake a vanilla cake. she used another 3/4 lb of flour to bake a chocolate cake. how much flour did she use altogether?

she use altogether flour is lb

Step-by-step explanation:

given data

flour to bake a vanilla cake = lb

flour to bake a chocolate cake =   lb

to find out

How much flour did she use altogether

solution

we know here flour use to make cake

so total flour is used = add both flour for vanilla and chocolate cake

total flour is used =   +  

total flour is used =  

she use altogether flour is lb

idk

step-by-step explanation:

idk

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.