1) Two students write the following expressions to answer an exercise: 7 + 4(5-3)2+3 And 9/3+(5-3) X 4+7 B. Explain the similarities in the steps. * Your answer A. Simplify the two expressions. List each step you use. ​

Find the value of the cosine for angle a

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil