Explanation

The multiples of 7 are {7, 14, 21, 28, 35, 42, 49, 56, 63, ...} and the multiples of 3 are {3, 6, 9, 12, 15, 18, 21, 24, 27, ...}. The least common multiple in these sets is 21.

\({5^3} \times {5^3}= \)

Simplify \(\sqrt{28}\)

The reciprocal of \(\frac{1}{4}\)is

Given the diagram of the parallelogram ABCD, when the angle of “A” is 60° what is the angle of “C”?

If \( x^{2} - 5 = 20\), what is the value of x?

If x = -3, calculate the value of the following expression:\(3x^{3} + (3x + 4) - 2x^{2}\)