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Describe the hormonal control over the menstrual cycle in females.

Menstruation in women is under the influence of the hypothalamic-pituitary-ovarian axis, or HPO axis. The pituitary gland secretes follicle-stimulating hormone (FSH) and luteinising hormone (LH), which act t...
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Answered by Tom C. • Biology tutor
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Consider how accurate it is to describe the USA as having a two-party system.

The United States of America is infamous for a lack of electoral success by third parties, such as the Libertarians and Greens. This is perhaps best explained by the first-past-the-post electoral systsem use...
JW
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Solve (3x +1)/x + (2x-1)/3 = -3, giving x to two decimal places.

(3x+1)/x +(2x-1)/3 = (2x 2 + 8x + 3)/3x by cross multiplying. So equation becomes 2x 2 + 8x + 3 = -9x by multiplying both sides by 3x. Adding 9x to both sides gives 2x 2 + 17x + 3 = 0. Using a calculator, an...
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Answered by Jorge A. • Maths tutor
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Example Oral Question: Was hast du letztes Wochenende gemacht?

Zum Beispiel: Letztes Wochenende bin ich mit meinen Freunden ins Cafe gegangen, um Kaffee zu trinken, und mit einander zu reden. Das hat mir gut gefallen, weil wir sehr gut mit einander auskommen. =auf Engli...
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Answered by Imogen L. • German tutor
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A car is moving on an inclined road with friction acting upon it. When it is moving up the road at a speed v the engine is working at power 3P and when it is moving down the road at v the engine is working at a power P. Find the value of P.

Incline is at θ where sin θ = 1/20 and mass of the car is 800kg and v is 12.5 m/s Up the road: Power = Fv F = R + (800g)/20 Power = (R + 40g)*25/2 = 3P …. P = (R + 40g)*25/6 Down the road: Power = Fv F = R –...
JM
Answered by Jonathan M. • Maths tutor
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