HELP please (part A)
to the nearest tenth of a foot, how far away from student A is the balloon ?
_feet

(part B)
to the nearest tenth of a foot, how far away from student B is the balloon?
_feet

(part C)
the balloon rises vertically so that distance between the balloon and student A is 90 feet. by how many feet did the balloon rise? express your answer to the nearest foot.
_feet

(part D)
After the balloon rises so that the distance between the balloon and student A is 90 feet, ehat is the angle of elevation from student A to the balloon? express your answer to the nearest tenth of a Degree.
_degree​

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

an = 22 + (n-1) *6

110 seats

step-by-step explanation:

an=a1+(n-1)(d)

a1 = 22   this is the first item in the sequence

d =6   this is how the sequence goes up

a)   an = 22 + (n-1) *6

b) a12 = 22 + (12-1) *6

    a12 = 22+11*6

  a12 = 22 +88

  a12 = 110