Hey can anyone pls pls pls help me out i will mark u as brainliest and will give 20 points

21 nails, total (estimated, or it is 20)-so she has some more time than she needed.

Step-by-step explanation:

The reason why it is 21 nails is because it takes 23 seconds for one nail and it takes 15 minutes to dry. 20-15=5 minutes, and 5/.23= about 21, or it can be rounded to the nearest number, 20 etcetera but by my math work I noticed that the answer was 21 (or rounded by 20).

How (labels):

5/.23= (estimated) 21.7

=(rounded) 22

=it will take the painter 20 minutes to finish, but she can do it in time.

=she has enough time to paint her nails, and some spare time.

≈22 nails, although she also may need to paint her toenails, which makes her have extra time still-she has 20 nails in total (like how everyone does-10 fingers, 10 toes).

For the last three questions:

1:

2. How many nails the woman can paint

3. Rounding (also answered above [an explanation] )

**For the first one, it is done by measuring and rounding.

I hope this helps!

-EarthGirl

(Tell me if this is wrong, I'll do anything for a Brainliest PLS)

assuming you mean addition: addition and subtraction are reverse operations.

step-by-step explanation:

answer: 0.64

step-by-step explanation: