더 연습해요!
|
연습 완료
0.0%
0/30
문제별 결과
1
Words in Context
오답
Handedness, a preferential use of either the right or left hand, typically is easy to observe in humans. Because this trait is present but less ______ in many other animals, animal-behavior researchers often employ tasks specially designed to reveal individual animals' preferences for a certain hand or paw.
Which choice completes the text with the most logical and precise word or phrase?
recognizable
정답
B
intriguing
C
significant
D
useful
해설 없음
2
Standard English Conventions
오답
Paintings by the renowned twentieth-century US ______ were featured in Artist to Artist, an exhibition at the Smithsonian Art Museum that paired the works of artists whose career trajectories intersected in meaningful ways.
Which choice completes the text so that it conforms to the conventions of Standard English?
A
artists: Thomas Hart Benton and Jackson Pollock,
artists Thomas Hart Benton and Jackson Pollock
정답
C
artists Thomas Hart Benton, and Jackson Pollock,
D
artists, Thomas Hart Benton and Jackson Pollock
해설 없음
3
Problem Solving and Data Analysis
오답
| Type of store | Average number of employees |
|---|---|
| Warehouse store | 365 |
| Department store | 213 |
| Supermarket | 130 |
A
83
B
152
235
정답
D
495
해설 없음
4
Advanced Math
오답
The expression \(90 y^5 - 54 y^4\) is equivalent to \(r y^4 (15 y - 9)\), where \(r\) is a constant. What is the value of \(r\)?
내 답안
(미작성)
정답
6
해설 없음
5
MCQ
오답
\(\operatorname*{lim}\limits_{x \rightarrow 0} \dfrac{x^2 - 1}{1 - 2 x^2} =\)
\(-1\)
정답
B
\(-\dfrac{1}{2}\)
C
\(\dfrac{1}{2}\)
D
\(1\)
E
non-existent
해설
Substitute \(x = 0\): \(\dfrac{-1}{1} = -1\).
6
Algebra
오답
The point \((8, 2)\) in the \(x y\)-plane is a solution to which of the following systems of inequalities?
\(x > 0\) and \(y > 0\)
정답
B
\(x > 0\) and \(y < 0\)
C
\(x < 0\) and \(y > 0\)
D
\(x < 0\) and \(y < 0\)
해설 없음
7
Algebra
오답
\( 2 a + 8 b = 198 \)
\( 2 a + 4 b = 98 \)
The solution to the given system of equations is \((a, b)\). What is the value of \(b\)?
내 답안
(미작성)
정답
25
해설 없음
8
Information and Ideas
오답
Many mosquito repellents contain natural components that work by activating multiple odor receptors on mosquitoes' antennae. As the insects develop resistance, new repellents are needed. Ke Dong and her team found that EBF, a molecular component of a chrysanthemum-flower extract, can repel mosquitoes by activating just one odor receptor—and this receptor, Or31, is present in all mosquito species known to carry diseases. Therefore, the researchers suggest that in developing new repellents, it would be most useful to ______
Which choice most logically completes the text?
identify molecular components similar to EBF that target the activation of Or31 receptors.
정답
B
investigate alternative methods for extracting EBF molecules from chrysanthemums.
C
verify the precise locations of Or31 and other odor receptors on mosquitoes' antennae.
D
determine the maximum number of different odor receptors that can be activated by a single molecule.
해설 없음
9
MCQ
오답
\(\displaystyle\int_{1}^{2} x^{-3} d x =\)
A
\(-\dfrac{7}{8}\)
B
\(-\dfrac{3}{4}\)
C
\(\dfrac{15}{64}\)
\(\dfrac{3}{8}\)
정답
E
\(\dfrac{15}{16}\)
해설
\([-x^{-2}/2]_1^2 = -\dfrac{1}{8} + \dfrac{1}{2} = \dfrac{3}{8}\).
10
Words in Context
오답
Former astronaut Ellen Ochoa says that although she doesn't have a definite idea of when it might happen, she ______ that humans will someday need to be able to live in other environments than those found on Earth. This conjecture informs her interest in future research missions to the moon.
Which choice completes the text with the most logical and precise word or phrase?
A
demands
speculates
정답
C
doubts
D
establishes
해설 없음
11
Problem Solving and Data Analysis
오답
For a particular machine that produces beads, 29 out of every 100 beads it produces have a defect. A bead produced by the machine will be selected at random. What is the probability of selecting a bead that has a defect?
A
\(\dfrac{1}{2,900}\)
B
\(\dfrac{1}{29}\)
\(\dfrac{29}{100}\)
정답
D
\(\dfrac{29}{10}\)
해설 없음
12
MCQ
오답
Particle velocity \(v(t) = e^t\). Distance from \(t = 0\) to \(t = 2\)?
\(e^2 - 1\)
정답
B
\(e - 1\)
C
\(2 e\)
D
\(e^2\)
E
\(\dfrac{e^3}{3}\)
해설
\(\displaystyle\int_{0}^{2} e^t dt = e^2 - 1\).
13
Algebra
오답
Sean rents a tent at a cost of \$11 per day plus a onetime insurance fee of \$10. Which equation represents the total cost \(c\), in dollars, to rent the tent with insurance for \(d\) days?
A
\(c = 11(d + 10)\)
B
\(c = 10(d + 11)\)
\(c = 11 d + 10\)
정답
D
\(c = 10 d + 11\)
해설 없음
14
Advanced Math
오답
The area \(A\), in square centimeters, of a rectangular cutting board can be represented by the expression \(w(w + 9)\), where \(w\) is the width, in centimeters, of the cutting board. Which expression represents the length, in centimeters, of the cutting board?
A
\(w(w + 9)\)
B
\(w\)
C
\(9\)
\((w + 9)\)
정답
해설 없음
15
Systems of Linear Equations
오답
Solve each system by using elementary row operations on the equations or on the augmented matrix.
\(2 x_1 + 4 x_2 = -4\)
\(5 x_1 + 7 x_2 = 11\)
내 답안
(미작성)
정답
Solve by elimination
해설 없음
16
Geometry and Trigonometry
오답
Note: Figure not drawn to scale.
For the right triangle shown, \(a = 4\) and \(b = 5\). Which expression represents the value of \(c\)?
A
\(4 + 5\)
B
\(\sqrt{(4)(5)}\)
C
\(\sqrt{4 + 5}\)
\(\sqrt{4^2 + 5^2}\)
정답
해설 없음
17
MCQ
오답
\(\displaystyle\int_{0}^{\dfrac{\pi}{2}} \cos x d x =\)
A
\(-\pi\)
B
\(-1\)
C
\(0\)
\(1\)
정답
E
\(\pi\)
해설 없음
18
MCQ
오답
Let \(f(x) = 1 - 3 x^2\). Which of the following is equal to \(f'(1)\)?
\(-6\)
정답
B
\(-5\)
C
\(5\)
D
\(6\)
E
Does not exist
해설
\(f'(x) = -6 x\). At \(x = 1\): \(-6\).
19
Solution Sets of Linear Systems
오답
Determine if the system has a nontrivial solution. Try to use as few row operations as possible.
\(-5 x_1 + 7 x_2 + 9 x_3 = 0\)
\(x_1 - 2 x_2 + 6 x_3 = 0\)
내 답안
(미작성)
정답
Yes, nontrivial solution exists. More unknowns than equations (3 unknowns, 2 equations), so at least one free variable.
해설 없음
20
Series - Concepts
오답
Explain what it means to say that \(\displaystyle\sum_{n=1}^{\infty} a_n = 5\).
내 답안
(미작성)
정답
해설 없음
21
Algebra
오답
What is \(10! - 7! \cdot 6!\)?
A
\(-120\)
\(0\)
정답
C
\(120\)
D
\(600\)
E
\(720\)
해설 없음
22
Algebra
오답
\(x + y = 18\)
\(5y = x\)
What is the solution \((x, y)\) to the given system of equations?
(15, 3)
정답
B
(16, 2)
C
(17, 1)
D
(18, 0)
해설 없음
23
Linear Functions - Graph
오답
What is the \(y\)-intercept of the line graphed?
A
\((0, -3)\)
B
\((0, -1)\)
C
\((0, 1)\)
D
\((0, 3)\)
해설 없음
24
Words in Context
오답
The general store was essential to daily life in the rural United States during the 1800s because it provided the supplies that the people living in nearby communities needed. Also, the store was a ______ of information. People socializing at the general store would share news and help spread it throughout their communities.
Which choice completes the text with the most logical and precise word or phrase?
source
정답
B
rival
C
condition
D
waste
해설 없음
25
Row Reduction and Echelon Forms
오답
Determine which matrices are in reduced echelon form and which others are only in echelon form.
a. \(\begin{pmatrix} 1 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 1 \end{pmatrix}\)
b. \(\begin{pmatrix} 1 & 0 & 1 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{pmatrix}\)
c. \(\begin{pmatrix} 1 & 0 & 0 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & 0 \end{pmatrix}\)
d. \(\begin{pmatrix} 1 & 1 & 0 & 1 & 1 \\ 0 & 2 & 0 & 2 & 2 \\ 0 & 0 & 0 & 3 & 3 \\ 0 & 0 & 0 & 0 & 4 \end{pmatrix}\)
내 답안
(미작성)
정답
Identify reduced echelon form vs echelon form for each matrix
해설 없음
26
Geometry and Trigonometry
오답
Note: Figure not drawn to scale.
In the figure, line \(m\) is parallel to line \(n\), and line \(t\) intersects both lines. What is the value of \(x\)?
A
33
B
57
C
123
147
정답
해설 없음
27
Algebra
오답
What is the y-intercept of the line graphed?
A
\((-5, 0)\)
B
\((0, 0)\)
\((0, 5)\)
정답
D
\((0, 9)\)
해설 없음
28
Words in Context
오답
Researchers and conservationists stress that biodiversity loss due to invasive species is ______. For example, people can take simple steps such as washing their footwear after travel to avoid introducing potentially invasive organisms into new environments.
Which choice completes the text with the most logical and precise word or phrase?
preventable
정답
B
undeniable
C
common
D
concerning
해설 없음
29
Information and Ideas
오답
Video Game Availability by Initial Release Years
In a recent study, researchers found that relatively few video games released over the decades remain available today. For example, only 14.22 percent of games are still available that were initially released in ______
Which choice most effectively uses data from the table to complete the statement?
| Initial release years | Percentage of games still available |
|---|---|
| 1975-1979 | 0.89 |
| 1980-1984 | 3.65 |
| 1985-1989 | 15.38 |
| 1990-1994 | 19.33 |
| 1995-1999 | 14.22 |
A
2000-2004.
1995-1999.
정답
C
1970-1974.
D
1985-1989.
해설 없음
30
Trig Derivatives - Basic
오답
Differentiate.
\(y = x^2 + \cot x\)
내 답안
(미작성)
정답
\(y' = 2x - \csc^2 x\)
해설 없음