B. x is an integer
C. either x or y is negative
D. y / x is an integer
E. x = ny where n is an integer
B.rectangle
C.square
D.trapezoid
The figure is a closed figure on a flat surface with four sides (a quadrilateral) and has only two sides parallel to each other. The other sides are not parallel to each other.
Thus, the given figure is a trapezoid because by definition, "A quadrilateral having at least two sides parallel is called a trapezoid".
The history of mathematics is nearly as old as humanity itself. Since antiquity, mathematics has been fundamental to advances in science, engineering, and philosophy.
During the 16th and early 17th Century, the equals, multiplication, division, radical (root), decimal and inequality symbols were gradually introduced and standardized.
The use of decimal fractions and decimal arithmetic is usually attributed to the Flemish mathematician Simon Stevin the late 16th Century, although the decimal point notation was not popularized until early in the 17th Century.
It has evolved from simple counting,measurement and calculation, and the systematic study of the shapes and motions of physical objects, through the application of abstraction, imagination and logic, to the broad,complex and often abstract discipline we know today.
Mathematical symbols were not created until the 16th Century. The earliest is the plus sign, +, in the 14th and the minus, -, is the 15th.
For more information about History of Mathematics click the link the below.
The correct answer is:
They had no numeral for zero in their number system.
Without a zero, it is hard to accurately represent real world problems. This makes it easier to use words rather than numbers.
A. general repair technician.
B. service manager.
C. electrical system specialist.
D. passenger comfort specialist.