270 degrees or -90 degrees.
Answer:

Step-by-step explanation:
remember that,

given that,
thus substitute:

divide both sides by 4/3π:

cubic root both sides:

and we are done!
46.78
Step-by-step explanation:
you divide 16 by the cos of 70 and it turns out to be 46.78
Answer:
Ali´s secret number is 13
Step-by-step explanation: