AnswersNC-Math 4 CRAdding and Subtracting Matrices

Adding and Subtracting Matrices — Cumulative exam Answers

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Which system is equivalent to ?

Question illustration
A
StartLayout Enlarged left-brace 1st Row 5 x squared + 6 y squared = 50 2nd row negative 21 x squared minus 6 y squared = 10 EndLayout
Option A
B
StartLayout Enlarged left-brace 1st Row 5 x squared + 6 y squared = 50 2nd row negative 21 x squared minus 6 y squared = 30 EndLayout
Option B
C
StartLayout Enlarged left-brace 1st Row 35 x squared + 42 y squared = 250 2nd row negative 35 x squared minus 10 y squared = negative 50 EndLayout
Option C
D
StartLayout Enlarged left-brace 1st Row 35 x squared + 42 y squared = 350 2nd row negative 35 x squared minus 10 y squared = negative 50 EndLayout
Option D
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What is the value of A in the matrix equation below?

Question illustration
A
mc023-2.jpg
Option A
B
mc023-3.jpg
Option B
C
mc023-4.jpg
Option C
D
mc023-5.jpg
Option D
43

The matrix below represents the distance in miles between three cities. A row label represents the city traveled from. A column label represents a city traveled to.What is the round trip distance in miles from city 1 to city 3?

Question illustration
A
15
B
30
C
50
D
70
44

The height y, in feet, of a football x seconds after it is thrown is modeled by the equation y = –16x2 + 24x + 1. What information does the zero of the equation 6 = –16x2 + 24x + 1 represent?

A
the height of the ball after 6 seconds
B
when the ball is 6 ft above the ground
C
the initial upward velocity of the ball
D
the horizontal distance traveled by the ball when it is 6 ft above the ground
45

If what is the value of w in terms of x and y?

Question illustration
A
w = StartFraction x minus 3 y Over 3 EndFraction
Option A
B
w = StartFraction x minus 3 y + 1 Over 3 EndFraction
Option B
C
w = x minus 3 y + 1
Option C
D
w = StartFraction x + 1 Over 9 y EndFraction
Option D
46

The total number of degrees, D, in an n-sided polygon is given by the formula When Janelle solves for n, she gets . Sophie solved the same equation for n and got an equivalent equation. Which of the following could be Sophie’s equation?

Question illustration
A
n = StartFraction D Over 360 EndFraction + 2
Option A
B
n = StartFraction D Over 180 EndFraction minus 2
Option B
C
n = D minus 178
Option C
D
n = D minus 182
Option D
47

What is the domain of the square root function graphed below?

Question illustration
A
x greater-than-or-equal-to negative 4
Option A
B
x greater-than negative 4
Option B
C
x greater-than-or-equal-to 0
Option C
D
x greater-than 0
Option D
48

Which of the following graphs represents a function?

A
On a coordinate plane, a graph shows an image of a curved line connected to a straight line. The curved line is upward facing and goes through the y-axis at (0, 0.75). The curved line connects with the straight line at (1, 0.75). The straight line has a negative slope and goes through the x-axis at (2, 0).
Option A
B
On a coordinate plane, a circle intercepts the x-axis at points (negative 2, 0) and (2, 0) and intercepts the y-axis between points 3 and 4 and also between points negative 3 and negative 4.
Option B
C
On a coordinate plane, a parabola opens right and has a vertex at (negative 3, 3).
Option C
D
A coordinate plane has 7 points. The points are (negative 4, 3), (negative 2, negative 5), (negative 1, negative 3), (1, 3), (2, negative 2), (4, negative 2), (4, 2).
Option D
49

What must be a factor of the polynomial function f(x) graphed on the coordinate plane below?

Question illustration
A
x – 4
B
x – 2
C
x + 2
D
x + 4
50

Which phrase best describes the translation from the graph y = 2x2 to the graph of y = 2x2 + 5?

A
5 units up
B
5 units down
C
5 units right
D
5 units left

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