The number 25 when converted from the tens and units base to the binary base (base two) is one of the following

Evaluate \(\frac{6.3 \times 10^5}{8.1 \times 10^3}\) to 3 significant fiqures

The positive root of t in the following equation, 4t2 + 7t - 1 = 0, correct to 4 places of decimal, is

The difference between the length and width of a rectangle is 6cm and the area is 135cm2. What is the length?