Correct Question :-
- If y = - 7 & x = - 21 , determine x when y = 9
Given :-
We need to find :-
Solution :-
Using proportion ,
By means & extremes ,
=> - 7x = - 21 × 9
=> x = ( - 21 × 9 ) / - 7
=> x = 3 × 9
=> x = 27
Hence , when y = 9 → x = 27
Consider, pls, this option:
(the sum of three angles must be 180°)
(60+x)+(x+85)+55=180;
2x=-20;
x= -10.
Note, that 60+85+55=200 > 180!
60+x=50° and x+85=75°.
If to check the sum.: 75+50+55=180°
Let's change all of them into seconds so it is easier to compare:
Pamela: 51 seconds.
Lucy: 3/5 minute x 60 = 36 seconds
Kady: 8 minutes x 60 = 480 seconds
Thus, Kady can stay underwater the longest.