90 attempts are made and only one third are successful. Multiply the attempts by successes and you get 30 successful shots (90 x 1/3= 30).
Answer:
Full proof below
Step-by-step explanation:

(-2.8)+0+(-2.6)+6.4
-2.8-2.6+6.4
-5.4+6.4
1
Hello :
1/(√6 -1) = (√6 +1)/(√6 -1)(√6 +1) = (√6 +1)/(√6)²-1² ) = (√6 +1)/5
The first option is correct (-x)