Top answers

How do I expand and simplify a double bracket equation?

For example: 3(2a + 5) + 5(a - 2) The key is to approach this question in two steps, with the first step being to expand the brackets before then simplifying where possible. A good method for expanding the b...
SB
Answered by Sonu B. • Maths tutor
8169 Views

Find the roots for the quadratic equation x^2 +2x-3 = 0

I would show the student two methods of solving this answer.The first method by:Finding two numbers that multiply to make -3 and simultaneously add to make +2.The two numbers that satisfy this is +3 and -1. ...
AN
Answered by Adibah N. • Maths tutor
10576 Views

How is blood glucose regulated?

High blood glucose levels - such as following a large, carbohydrate rich meal. The increase is detected by Beta cells of the pancreas, which release insulin (a hormone) into the blood. Insulin acts on cells ...
LK
Answered by Lois K. • Biology tutor
2992 Views

Why indentation is important in Python and what is the scope of a global variable?

Normally, in every programming language we should normally use indentation in order to have a nice style and a readable code. But Python programs are structured through indentation, so different code blocks ...
GP
3165 Views

The ionic product of water, Kw = 2.93 × 10−15 mol dm−6 at 10 °C. Calculate the pH of a 0.0131 mol dm−3 solution of calcium hydroxide at 10 °C Give your answer to two decimal places.

[OH-] = 0.0262 mol dm-3[H+] = (Kw/[OH-]) = 2.93 x 10−15 / 0.0262 (= 1.118 x 10−13) pH = (− log (1.118 x 10−13) = 12.9514 = 12.95
WB
Answered by William B. • Chemistry tutor
7077 Views