A vacuum flask is a type of flask that aims to stop:
A) Conduction
B) Convection
C) Radiation
D) All of these
Which statement is false?
A) All natural numbers are integers
B) All integers are rational numbers
C) Every real number is either a rational or irrational number
D) Every whole number is a natural
number
Explanation: Whole numbers include all the positive integers (1, 2, 3, ...) as well as zero (0), denoted by the set of numbers {0, 1, 2, 3, ...}.
On the other hand, natural numbers are defined as the positive integers excluding zero, denoted by the set of numbers
{1, 2, 3, ...}.
Therefore, zero (0) is the key distinction between whole numbers and natural numbers. Every natural number is a whole number, but the reverse is not true. Zero is a whole number but not considered a natural number.
(-2)4 ____________ -(2)4
A) <
B) >
C) =
D) >
Explanation:To evaluate the expression (-2)4 and -24, let's calculate both expressions and compare them.
(-2)4 means raising -2 to the power of 4:
(-2)4 = (-2) × (-2) × (-2) × (-2) = 16
On the other hand, -24 means raising -2 to the power of 4 without parentheses, which means only the base (-2) is being squared and not the negative sign:
-24= -(2 × 2 × 2 × 2) = -(16) = -16
Now we can compare 16 to -16:
16 > -16
Therefore, the correct answer is B) > (greater than).
What
is the length of the side of a square whose area is 289m2?
A) 13m
B) 17m
C) 19m
D) 23m
