A rectangle is 2 √7 feet wide and 3 √7 feet long. What is the area, in square feet, of the rectangle?

Can some one me, i’ve been asking for so long

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

What are the excluded values? m+5/mn+3m