Find values of 3sin^2x-2cosx-3=0

Step-by-step explanation:

3 sin²x-2cos x-3=0

3(1-cos² x)-2 cos x-3=0

3-3 cos²x-2 cos x-3=0

-3 cos ²x-2 cos x=0

cos x( -3cos x-2)=0

cos x=0

x=(2n+1)π/2,where n is an integer.

or -3 cos x-2=0

3 cos x=-2

cos x=-2/3

x=cos ^{-1}(-2/3)≈131.81°

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40