Find the square. Simplify your answer. \[ (2 s-1)^{2} \]

The sum of the numerator and th denominator of a fraction is 18 . If is added to both its numerator an denominator, the reduced form of th new fraction so obtained is \( \frac{2}{3} \). The the original fraction is ........

191. Hilda has \( \$ 210 \) worth of \( \$ 10 \) and \( \$ 12 \) stock shares. The numbers of \( \$ 10 \) shares is five more than twice the number of \( \$ 12 \) shares. How many of each does she have?

The sum of the numerator and the denominator of a fraction is 18 . If 1 is added to both its numerator and denominator, the reduced form of the new fraction so obtained is \( \frac{2}{3} \). Then, the original fraction is ........

187. Julie went to the post office and bought both \( \$ 0.41 \) stamps and \( \$ 0.26 \) postcards. She spent \( \$ 51.40 \). The number of stamps was 20 more than twice the number of postcards. How many of each did she buy? 188. Jason went to the post office and bought both \( \$ 0.41 \) stamps and \( \$ 0.26 \) postcards and spent \( \$ 10.28 \). The number of stamps was four more than twice the number of postcards. How many of each did he buy? 189. Maria spent \( \$ 12.50 \) at the post office. She bought three times as many \( \$ 0.41 \) stamps as \( \$ 0.02 \) stamps. How many of each did she buy?

a) \( 2 x \geq-9 \)