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x^2 - x - 90 = 0. Solve to find x.

Comparing to this to ax^2 + bx + c = 0, you'll find that a=1, b=-1, c=90. You need to split b (in this case -1), into two numbers that add up to b (-1), and multiply to ac (90). -> These are -10 and 9. No...
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Answered by Yanakan L. • Maths tutor
4633 Views

Both Fish and Mammals have ventilation mechanisms. Explain the function of ventilation mechanisms and name the muscles which operate the ventilation mechanism in mammals.

The function is to move the respiratory medium (air or water) over the respiratory surface; to maintain the concentration gradient. In mammals, the diaphragm and the intercostal muscles are responsible for v...
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Answered by Bobola A. • Biology tutor
10102 Views

What are the different types of prepositions and how do I know which one to use and how?

There are 3 types of prepositions, akkusativ, dativ and genetiv. Akkusativ is when something is the object in the sentence and is certain prepositions like fuer and durch that always take akkusativ. This mea...
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Answered by Emily O. • German tutor
2871 Views

What is aerobic respiration and why is it important in the human body?

Aerobic respiration is the process by which energy is released from glucose in the presence of oxygen (as indicated by the word 'aerobic'). While in reality it is a complex, multi-step series of reactions co...
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Answered by Harriet L. • Biology tutor
20261 Views

The difference between the imperfect and the preterite in Spanish

This is potentially one of the hardest parts of learning Spanish as a foreigner, especially as you are unable to convey the same meaning in the English language. These are both verbs referring to the past. T...
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Answered by Alexander C. • Spanish tutor
2920 Views