The first programmer can write an app in 10 days. the second programmer can finish the same job in 8 days. how long would it take them to finish the job if they were working together?

40/9 days

Step-by-step explanation: let x be the time when they work together

daily rate of the first programmer = 1/10

daily rate of the second programmer = 1/8

daily rate when they work together = 1/x

Therefore:

1/10 + 1/8 = 1/x

solving the equation:

9/40 = 1/x

x = 40/9

$33

Step-by-step explanation:

The price at the end of the week is $33.

Step-by-step explanation:

We are given that on Monday the price of a company’s stock is $30 per share. On Tuesday, the stock price drops $3, on Wednesday it rises $7, on Thursday it rises $3, and on Friday it drops $4.

The price of a company’s stock on Monday = $30 per share

So, the mathematical statement that represents the situation is given by;

Price of company’s stock on Monday = $30

On Tuesday, the stock price drops $3, so the price of company’s stock on Tuesday = Price of company’s stock on Monday - Drop in price on Tuesday

             = $30 - $3 = $27

On Wednesday, the stock price rises $7, so the price of company’s stock on Wednesday = Price of company’s stock on Tuesday + Rise in price on Wednesday

             = $27 + $7 = $34

On Thursday, the stock price rises $3, so the price of company’s stock on Thursday = Price of company’s stock on Wednesday + Rise in price on Thursday

             = $34 + $3 = $37

On Friday, the stock price drops $4, so the price of company’s stock on Friday = Price of company’s stock on Thursday - Drop in price on Friday

             = $37 - $4 = $33

Hence, the price at the end of the week is $33.