The first term of a geometric sequence is 4 and the multiplier, or ratio, is –2. what is the sum of the first 5 terms of the sequence?

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years