Please do no 7 for me. I’m practising for my exam and can’t find the solution. The correct answer will get 15 points. No spam

Step-by-step explanation:

Prove that

Recall that ta x = sin x/ cos x and sec x = 1/cos x. So the 1st term on the LHS becomes

or with the cos x cancelling out, the equation becomes

Combining the terms on the LHS,

  the correct choice is marked

step-by-step explanation:

the first two graphs show multiple turning points. the last graphs matches the description in every detail.

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9