One

Two

Four

Three

None of these

Real and equal

Imaginary

Real and unequal

(y - 4) and (y - 6)

(y - 4) and (y + 6)

(y + 4) and (y + 6)

(y + 6) and (y - 6)

b² - 4ac

b²

$\frac{b^2-4ac}{2a}$

-4ac

$x=\sqrt{b^2-4ac}$

$x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

None of these

$a{x}^2+bx+c=0$

{-1}

{1}

$\left\{\pm 1\right\}$

{}

Equation

Both identify and identical equation

Identity

Identical equation

None of these

Variables

Constant numbers

Complex number

Constant

Variable

None of these

Variate

None of these

Root (s)

Both A and B

Value (s) of solution set

Annuity due

Ordinary annuity

Perpetuity

Contingent annuity

Sum of ordinary annuity

Sum of annuity due

Present value of ordinary annuity

Present value of annuity due

Different

Distinct

Identical

Both A and C

$D_{\overline{n}|i}$

$S_{\overline{n}|i}$

$U_{\overline{n}|i}$

$a_{\overline{n}|i}$

None of these

Perpetuity

Present value of annuity

Sum of annuity

Original payments and interest

Original payments and discount

None of these

Interest and payments yet not made

Present value of annuity

Simple interest method

Compound interest method

Sum of annuity

$\left[\frac{(1+i{)}^n-1}{i}\right]$

$\left[\frac{(1+i{)}^{-n}-1}{i}\right]$

$\left[\frac{(1+i{)}^n+1}{i}\right]$

$\left[\frac{i-(1+i{)}^{-n}}{i}\right]$

Both A and B

None of these

Annuity period

Payment period

6.25

24.88

6.05

20.88