Practice Quiz Mode
Take all 4 MCQs in interactive quiz mode with timer and progress tracking
$x^{2}+20x+y^{2}+16y=-20$
The equation above defines a circle in the $xy$-plane. What are the coordinates of the center of the circle?
Difficulty: Hard
A:
$(-20,-16)$
B:
$(-10,-8)$
C:
$(10,8)$
D:
$(20,16)$
A rectangle has an area of 63 square meters and a length of 9 meters. What is the width, in meters, of the rectangle?
Difficulty: Easy
A:
7
B:
54
C:
81
D:
567
What is the diameter of the circle in the $xy$-plane with equation $\left(x-5\right)^{2}+\left(y-3\right)^{2}=16$?
Difficulty: Hard
A:
4
B:
8
C:
16
D:
32
Triangle $XYZ$ is similar to triangle $RST$ such that $X$, $Y$, and $Z$ correspond to $R$, $S$, and $T$, respectively. The measure of $\angle Z$ is $20^{\circ}$ and $2XY=RS$. What is the measure of $\angle T$?
Difficulty: Hard
A:
$2^{\circ}$
B:
$10^{\circ}$
C:
$20^{\circ}$
D:
$40^{\circ}$
Premium content
Sign in and upgrade to continue reading.