Select the correct answer.
If the determinant of this matrix is -19, what is the value of a?

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

just take the area of the square and then the area of the circle then subtract the circle area from the squares area

step-by-step explanation:

answer: 4 (:

step-by-step explanation: