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� AQA � GCSE Revision Foundation Mathematics � England ������ �� ��������. �������: x px, x px �������� � ��������� ������������� � ��������� ������� �������, ����� �������, ����������-�������, ��� �������� � ������� ������������� �������: x px, x px, 64x64 px �������� �. Learn everything an expat should know about managing finances in Germany, including bank accounts, paying taxes, getting insurance and investing. a aa aaa aaaa aaacn aaah aaai aaas aab aabb aac aacc aace aachen aacom aacs aacsb aad aadvantage aae aaf aafp aag aah aai aaj aal aalborg aalib aaliyah aall aalto aam.
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A worksheet involving the forming and solving of equations from real life contexts. Log in Forgotten password? Lesson 1 Activity 1 0. Lesson 1 Worksheet 1 0. Access thousands of exam questions with Exampro Mathematics.

Substitute numerical values into formulae and expressions, including scientific formulae. Solve linear equations in one unknown algebraically including those with the unknown on both sides of the equation. Solving linear equations is recapped, followed by solving quadratic equations by factorising.

Simultaneous equations are derived from questions in context and solved algebraically both by substitution and elimination. A wide range of types of problems are presented and reasoning skills are developed through the setting up and solving of these problems; including solving a range of types of equations.

At the end of the unit, degrees of accuracy are explored along with the impact of accuracy levels on calculations. Order and download the free teaching unit in this series. Each unit contains:. This is such a steep learning curve, but PG Online materials have been great and really support me and my students.

Use the following equation:. This equation which you know from Maths will be necessary when analysing inhibition zones caused by antibiotics or antiseptics on bacterial growth. To calculate the rate of transpiration , you could measure the distance a bubble moves in a potometer over time.

Alternatively, you could measure the speed of product formation. For example, the rate of photosynthesis can be calculated by measuring the volume of oxygen produced over time or the number of oxygen bubbles produced over time. A trickier one is calculating the rate of lipase-controlled reactions. Here, the product fatty acid leads to a drop in pH and therefore the change in pH over time can be used to work out the rate of reaction.

You could measure the speed of reactant use, for example, by measuring a change in mass over time, including the drop in mass of compost material in decay reactions. In all cases, the units for the rate will depend on the units used for time and the other variable.

Search Close. Back to blog. Magnification You need to be able to rearrange this equation. Estimates In the exam, you may need to estimate the size of a cell. There are two ways of doing this. Estimate the size of a cell � Method 1 This method works best under lower magnifications. Estimate the size of a cell � Method 2 A more accurate estimate of cell size can be found by using an eyepiece graticule.

Estimate the population of a stationary species In the Biology GCSE exam, you may be asked to estimate the population of a species in a habitat. For an estimate of the number of a plant species in a field , follow the steps below: Count the number of individuals of a species in each of 10 quadrats.

Calculate the total number of individuals in Step 1 and then divide by 10 to work out the average number of the species in each quadrat.

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