Heidi must correctly answer at least 80% of the questions on an exam to advance to the next
level in her online course. heidi has already correctly answered 26 questions and incorrectly
answered 4 questions. how many of the 15 questions remaining must heidi correctly answer
to advance to the next level?
a. at least 10
b. at least 11
c. at least 12
d. at least 13

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: