Write the expression 10x8 – 6x4 – 20 in quadratic form, if possible.
a. 10(x4)2 – 6(x2)2 – b. 10(?)4 - 6(x2)2
20
20
c. 10(x4)2 – 6(x4) – 20
d. not possible

Aaron invested a total of $4,100, some in an account earning 8% simple interest, and the rest in an account earning 5% simple interest. how much did he invest in each account if after one year he earned $211 in interest? select one: a. $200 at 8%, $3,900 at 5% b. $3,200 at 8%, $900 at 5% c. $900 at 8%, $3,200 at 5% d. $3,900 at 8%, $200 at 5%