1: Bellringer Heather would like to have an average of 90 in her science class.
There are four assignments with the following grades:
82, 95, 88, 86
What grade will Heather need to make on the last assignment to meet her goal?
O 98
O 99
O 87
O 88

99

Step-by-step explanation:

Grades obtained:

Target grade:

Required grade = x, then average is:

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