Answer:
87
Step-by-step explanation:
A negative times a negative always equals a positive, and 10 times anything is just moving the decimal point to the right once, so 8.7 becomes 87.0
Answer:

Step-by-step explanation:
we know that
The probability of an event is the ratio of the size of the event space to the size of the sample space.
The size of the sample space is the total number of possible outcomes
The event space is the number of outcomes in the event you are interested in.
so
Let
x------> size of the event space
y-----> size of the sample space
if a die is rolled the sample space is

if two dice rolled the sample space is

so
The possible pairs are

The size of the event space x is



substitute

Simplify

For solving varible's and for real life questions.
EXAMPLE when you want to figur out what does X eqles
X×4=12 you have to take 12÷4 and that eqles 3