Please I need Help
1. Write the explicit formula for the geometric sequence a1 = â7, r = 4.
a. an = 7(â4)nâ1
b. an = â7(4)nâ1
c. an = 4(â7)nâ1
2. An engineer determines that the shape of a mirror surface in a motion sensor can be described by the equation 9x^2 â 25y^2 â 12x + 20y = 26. Identify the conic section that represents the shape of the mirror.
a. parabola
b. circle
c. ellipse
d. hyperbola
3. A contractor must pay a penalty if work on a project is not completed on time. The penalty on the first day is $200. The penalty increases to $500 on the second day, to $800 on the third day, and so on. The contractor accumulated a penalty of $4100. How many days after the due date was the project completed?
a. 14 days
b. 23 days
c. 5 days
Please I need Help
1. Write the explicit formula for the geometric sequence a1 = â7, r = 4.
a. an = 7(â4)nâ1
b. an = â7(4)nâ1
c. an = 4(â7)nâ1
2. An engineer determines that the shape of a mirror surface in a motion sensor can be described by the equation 9x^2 â 25y^2 â 12x + 20y = 26. Identify the conic section that represents the shape of the mirror.
a. parabola
b. circle
c. ellipse
d. hyperbola
3. A contractor must pay a penalty if work on a project is not completed on time. The penalty on the first day is $200. The penalty increases to $500 on the second day, to $800 on the third day, and so on. The contractor accumulated a penalty of $4100. How many days after the due date was the project completed?
a. 14 days
b. 23 days
c. 5 days
