What's the correct answers? quick and concise explanation .

2, 3, 4 and 7  are correc.t

Step-by-step explanation:

sec^2 x = 1 + tan^2x

so sec^2 x - 1 = tan^2 x

So the second choice is correct.

sec^2 x - cos^2x - sin^2x

= sec^2 x - (cos^2x + sin^2 x()

= sec^2 x - 1

The third is correct.

sec^2x / csc^2x =  1 /  cos^2x / 1 / sin^2x

= sin^2x / cos^2x

= tan^2x

= 1 - sec^2 x

So the fourth choice is correct.

1 - cos^2x / cos^2 x

=  sin^2x / soc^2x

= tan^2x

= 1 - sec^2x

The seventh choice is correct.

relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.

it alot will look like this 4.4

60

step-by-step explanation:

every triangle measures a total of 120 degrees. you have to find angle c. we know that isosceles triangles angles are equal. 60 degrees plus 60 degrees gives you 120.