Section 4: Present Perfect B. Complete the sentences using the Present Perfect tense. Use the correct form of the verb in brackets.

5. A recipe for lemon bars calls for a \( 9^{\prime \prime} \times 13^{\prime \prime} \) pan. How many \( 1^{\prime \prime} \times 1^{\prime \prime} \) bars only the cut? How many \( 2^{\prime \prime} \times 2^{\prime \prime} \) bars can be cut? How much is wasted if you serve only \( 2^{\prime \prime} \times 2^{\prime \prime} \) square bars?

8.) Solve \( 2 x^{2}-x=15 \) by factoring.

(1) Dos esteras una de 5 MC y 10 MC estan separadas por una distancia de 250 mm hayar la fueria de repulsión entre ellos en libras.

3. \( 4 x^{2}, x y,-2 x y, 3 y^{2}, y^{2} \)

9.) Given the equation \( x^{2}+6 x-3=0 \) a. What is the value of the discriminant? (b. The discriminant will determine that there will be c. Find all solutions to the equation using the quadratic formula.