Factor completely.
15a² + 55a - 20
a. 5(3a² + 11a - 4)
b. 5(a + 4)(3a - 1)
c. (5a + 2)(3a - 10)
d. (5a + 4)(3a - 5)

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

The ivring berlin learning center would like a possible net profit of $650,000 on its new resource manual it sells to schools. the fixed costs for producing the manual are $780,000 and the variable cost per package is $19.85. if the estimated unit sales are 1,250,000 units, what selling price unit should the ivring berlin learning center try?