Work out the value of 5t squared - 7 when t= 4

Question and answers are in the attached picture. you so much in advance.

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

Which statements are true? check all that apply. the line x = 0 is perpendicular to the line y = –3. all lines that are parallel to the y-axis are vertical lines. all lines that are perpendicular to the x-axis have a slope of 0. the equation of the line parallel to the x-axis that passes through the point (2, –6) is x = 2. the equation of the line perpendicular to the y-axis that passes through the point (–5, 1) is y = 1.