Algebra 2 — Semester B Practice

Question 1 of 10

TEKS 5A-5CMedium Diagram

Which equation matches this exponential graph?

Ay = (1/2)ˣ (decay)

By = log₂(x)

Cy = 2ˣ (growth)

Dy = x²

Explanation

Curve approaches 0 as x → −∞ and grows rapidly as x increases → exponential growth.

Question 2 of 10

TEKS 5A-5CMedium

A radioactive isotope has a half-life of 10 years. What fraction remains after 40 years?

A1/8

B1/40

C1/4

D1/16

Explanation

40 / 10 = 4 half-lives. (1/2)⁴ = 1/16.

Question 3 of 10

TEKS 5A-5CMedium

Use log properties to simplify: log(8) + log(125).

Blog(625)

Dlog(133)

Explanation

log(a) + log(b) = log(ab). log(8) + log(125) = log(1000) = 3 (assuming log base 10).

Question 4 of 10

TEKS 6M-6PHard

For f(x) = (x + 2) / [(x + 2)(x − 5)], where is the hole?

Ano hole

Bx = 5

Cx = −2

Dx = 2

Explanation

(x + 2) cancels → simplifies to 1/(x − 5). The cancelled factor (x+2 = 0 at x = −2) creates a hole.

Question 5 of 10

TEKS 5A-5CEasy Diagram

Which graph shows exponential decay?

ABoth

BA (curve rising)

CB (curve falling toward x-axis)

DNeither

Explanation

Exponential decay: starts high, falls toward zero. Graph B matches; graph A is exponential growth.

Question 6 of 10

TEKS 6M-6PEasy Diagram

Which graph corresponds to f(x) = 1/x?

AA line through the origin

BA V-shape

CA parabola opening up

DA two-branch hyperbola in quadrants I and III

Explanation

f(x) = 1/x has two branches: positive x → positive y (Q I), negative x → negative y (Q III), with asymptotes at the axes.

Question 7 of 10

TEKS 6M-6PEasy Diagram

For the function whose graph approaches the dashed lines, what type of function is this most likely?

AAbsolute value

BPolynomial

CLinear function

DRational function

Explanation

Both vertical and horizontal asymptotes are characteristic of rational functions where degrees of numerator and denominator are similar.

Question 8 of 10

TEKS 5A-5CHard

$5,000 invested at 6% continuously for 5 years (use A = Pe^rt):

A≈ $5,300

B≈ $6,750

C≈ $7,500

D≈ $6,500

Explanation

A = 5000 · e^(0.06·5) = 5000 · e^0.3 ≈ 5000 · 1.3499 ≈ $6,749.

Question 9 of 10

TEKS 5A-5CMedium

Which represents continuous compound interest of $P at rate r for t years?

APe^r/t

BP(1 + r)^t

CPe^rt

DP(rt)

Explanation

Continuous compounding uses A = Pe^(rt). The discrete annual formula is P(1 + r)^t.

Question 10 of 10

TEKS 7A-7IMedium Diagram

The graph shown most likely belongs to which polynomial?

AA line

BOdd-degree polynomial with positive leading coefficient

COdd degree, negative leading coefficient

DEven-degree polynomial

Explanation

Left end goes up (+∞), right end goes down (−∞). That signature is odd degree, negative leading coefficient.

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