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Triangle ABC has perimeter 20 cm. AB = 7 cm. BC = 4 cm. By calculation, deduce whether triangle ABC is a right-angled triangle. 4 marks.

We know that the perimeter of the triangle is 20cm and we also know the value of two of the sides of the triangle, AB=7cm and BC=4cm. We can work out the length of the third side (AC) by subtracting the know...
CM
Answered by Charlotte M. • Maths tutor
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Potassium forms an ionic compound with sulfur.Describe what happens when two atoms of potassium react with one atom of sulfur. Give your answer in terms of electron transfer. Give the formulae of the ions formed

Since potassium is an alkali metal (first column of periodic table), it has one electron in its outer shell. Sulfur, however, has six electrons in its outer shell. In an ionic bond, electrons are donated fro...
RS
Answered by Reece S. • Chemistry tutor
17900 Views

TMV (tobacco mosaic virus) can cause plants to produce less chlorophyll. This causes leaf discoloration. Explain why plants with TMV have stunted growth.

The virus is causing less chlorophyll to be produced. This is a problem as chlorophyll is an essential component in photosynthesis. Photosynthesis is a process by which plants are able to use sunlight in the...
RS
Answered by Reece S. • Biology tutor
14364 Views

If x:y = 7:4 and x+y = 88 , work out the value of x–y.

We know that x:y is 7:4, and therefore x is seven-elevenths of the total value of x and y. Therefore we can express x = 7/11 (x+y). Since we also know that the total of x+y is 88, we can substitute this into...
RS
Answered by Reece S. • Maths tutor
12644 Views

Describe and compare the processes of abrasion, solution and attrition in a coastal landscape (5 marks)

This question is a describe question so you do not have to explain how these processes work, you should point out similarities and differences between the three processes. You should write five clear points ...
TM
Answered by Tessa M. • Geography tutor
8085 Views