Select the correct answer. In the diagram, transversal t cuts parallel lines a and b. Which equation is necessarily true?

A.
m∠1 = m∠7

B.
m∠3 = m∠6

C.
m∠5 + m∠8 = 90°

D.
m∠6 + m∠7 = 180°

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)

What is the equation of the line that is parallel to the line with the equation y= -3/4x +1 and passes through the point (12,-12)