Need some help with these please,

---What algebraic equation will represent the English sentence. (Letxrepresent the unknown number). Then solve the equation.

The product of negative one-half and a number is twelve.

• -1/2+x=12;x=25/2
• -1/2-x=12;x=-25/2
• -1/2x=12;x=-6
• -1/2x=12;x=-24

---A catapult is designed to launch circus performers from a raised platform. After launch, the height of the performer in feet is given by h(t)=-16t²+80t+32wheretis seconds after launch. After how many seconds is the performer at ground level? Round to the nearest tenth of a second.

---The product of ten and the sum of two and a number is five times the number. Find the number.

---The point (-9,-10) is in the _____quadrant.