I need help pl lol
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21. 1 hr 52 min 30 sec or 1.875 hours

Step-by-step explanation:

21. Each hour, Sally paints 1/3 of the room and Steve paints 1/5 of the room.

If it takes both of them x hours to paint the room If they are both working together, then, each hour, 1/x of the room gets painted.

So, 1/3 + 1/5 = 1/x

Multiply both sides by the LCD, 15x:  5x + 3x = 15  

                                                          8x = 15  

                                                            x = 15/8 hours  

                                                              = 1.875 hours  

                                                              = 1 hr 52 min 30 sec

answer:

1. 0.04

2. 0.15

step-by-step explanation:

i just finished that assignment for properties of probability distributions.

answer: city needs 2.4 inches of rainfall more to match the record of 40 inches.

step-by-step explanation:

since we have given that

total annual rainfall a city record = 40 inches

this year, total rainfall recorded = 37.6 inches

number of inches of rainfall   is needed to match the record of 40 inches is given by

hence, city needs 2.4 inches of rainfall more to match the record of 40 inches.