Hello, I need help solving question 3 c . This is relating to trigonometric relationships between acute and obtuse angles (ASTC)

What is the value of this expression when b= 5 6 (2b-4)

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

At oaknoll school, 90 out of 270 students on computers. what percent of students at oak knoll school do not own computers? round the nearest tenth of a percent.