Rewrite the series 4-10+25-62.5+156.25-390.625 using sigma notation

The table shows a pattern of exponents. what is the pattern as the exponents decrease?

The lee family bought their home for $220,000 this year. the equation =220,000(1.038) v = 220 , 000 ( 1 . 038 ) x can be used to find the value, v, of their home after x years. which will be the value of the lee family's home in 5 years?

What is the y intercept of f(x)=(1/2)^x?