Verify the identity cos quantity x plus pi divided by two = -sin x

Identity is verified.

Step-by-step explanation:

We have to verify the identity

To prove any identity we always prove one side(either left hand side or right hand side) of the equation equal to the other side.

In this identity we take the left hand side first

 (as we know cos(a+b) = cosa×cosb-sina×sinb)

= - sinx ( Right hand side)

Hence identity is proved.

93.8

step-by-step explanation:

lets say, first number = x

second number = 3x+7

total = 49

(x)+(3x+7)= 49

4x+7 = 49

4x = 42

x = 42/4

x= 10.5

x= 10.5

3x+7 = 3(10.5)+7 = 93.8

hope this