1) (+3) + (-1 ) =
2) ( -3 ) + ( -2 ) =

1) 2           2) -5

Step-by-step explanation:

1.

It's positive 3 PLUS negative 1 which can be written as 3 - 1. That is 2.

2.

It's negative 3 PLUS negative 2 which can be written as -3 - 2. That is -5.

1) 2

2) -5

Step-by-step explanation:

It's always a great idea to use a number line when you are solving problems like these. In the first problem we are starting at positive 3, so go to the number 3 on the number line. Then we are adding a negative 1, so we need to go back 1 on the number line. If we added a positive 1 we would need to go forward 1, but since this is a negative 1 we need to go backwards.

When you go back 1 from 3, you should get 2! Try this method for any other problem as well.

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column