Answer:

Step-by-step explanation:
To evaluate :

Solution:
Two negatives multiply to become a positive.
Thus, we can remove parenthesis by reversing the signs of the fraction by multiplying the negative outside.
⇒ 
Since the denominators are same for both fractions, so we simply add the numerators.
⇒ 
⇒
(Answer)
Answer:
The probability that the card is an ace is 
Step-by-step explanation:
Total number of playing cards = 52
Total number of ace cards = 4
She selects one card at random from the deck.
We are supposed to find the probability that the card is an ace
So, Probability of getting card= 
Probability of getting card= 
Hence the probability that the card is an ace is 
Actually you should look it up there are so answers that can help you solve them<span />
Answer:
5
Step-by-step explanation:
Take the total amount spent and divide it by the cost of each microscope.
$499.50 ÷ $99.90 = 5
-1 -4 is the awnser to the question