Rectangle R and S are similar figures. Find the perimeter of rectangle R. sorry my hand's are a little shaky

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

The dash figure is a dilation if the original figure. find the scale factor. classify the dilation as an enlargement or a reduction

What ia the sum if the first 7 terms of the geometric series