7 x 21 is equivalent to 21 x 7
also 3 x 49
Answer:
3y - 5 + 2y = 7
Step-by-step explanation:
Subtracting 5 from the second equation gives ...
x = 3y -5
Using the expression on the right for x in the first equation gives ...
x + 2y = 7 . . . . . . . . first equation
(3y -5) +2y = 7 . . . . with expression substituted for x
3y - 5 + 2y = 7 . . . . with parentheses removed
Answer:
4. x = 7
5. A
Step-by-step explanation:
you can't use a calculator ?
4.
x² = 49
x = 7
5.
sqrt(4) = 2
triple root (8) = 2
sqrt(16) = 4
only sqrt(2) is a never-ending sequence of digits without any repeating pattern after the decimal point. and that is the meaning of irrational numbers. they can never be described by an expression a/b, where a and b are integer numbers.