Answer:
x = 3 or -3
Step-by-step explanation:
So you have the equation x² - 9 = 0
Move the 9 to the other side: x² = 9
Then take the square root of both sides:
= ±
x = ±
= ±3
x = 3 or -3
The answer to this problem is 2/5
The speed of Sali is 18.75 km/hr.
Given,
Total distance travelled by Jane and Sali =63 km.
The total time is taken by Jane=3.5 hours.
Sali started to cycle 4 minutes after Jane started to cycle
hours.
<h3>What is the formula to find speed?</h3>
The formula to find speed is
.
The speed of Jane
.
Let the speed of Sali be
.
Sali caught up with Jane when they had both cycled 30 km.
Thus, 





Therefore, the speed of Sali is 18.75 km/hr.
To learn more about the speed visit:
brainly.com/question/7359669.
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