the 4th term in a geometric sequence is -15, the 5th term is 45, and the 6th term is -135. find the sum of the first 7 terms.
1) -105
2) -101 1/9
3) 305
4) 303 8/9

Which statement is always true? a negative exponent cannot be part of an expression's numerator. a negative base raised to the power of 2 has a negative value. a negative base raised to the power of 2 has a positive value. any number to the first power is zero.

Can some one explain how to slove specifically, what is the value of x? 0.9(x+1.4)-2.3+0.1x=1.6 enter the answer as a decimal in the box. x= ?

Will positive numbers always have a higher absolute value than negative numbers?