13. three of four numbers have a sum of 22. the four numbers is 8, what is the fourth number?

-4

Step-by-step explanation:

Given : There are 4 numbers .

The sum of three numbers is 22

The sum of 4 numbers is 8.

To Find : The fourth number.

Solution :

Let first no. be w

Let second no. be x

Let third no. be y

Let fourth no. be z

Since we are given that The sum of 4 numbers is 8.

⇒w+x+y+z=8  ---(a)

We are also given that the sum of three numbers is 22

⇒w+x+y=22

Now put this value in a

⇒w+x+y+z=8

⇒22+z=8

⇒z = 8-22

⇒z = -14

Hence , The fourth number z is -4

hey there!

if she's saving for six months, let's divide the total number we need for the trip by six, dividing it into the amount that needs to be saved for each month.

500 ÷ 6 =

she needs to save at least this amount each month, so we should use this symbol: ≥

let x be the amount she saves each month.

your final answer is x ≥

hope this !

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or