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Solve the equation x^2-9x+20

Multiples that equal 20: 1 and 20, 2 and 10, 4 and 5Which of these multiples add/subtract to give -9?= -4 and -5Therefore answer is:(x-4)(x-5)=0x= 4 or x= 5

Answered by Megan C. • Maths tutor

3581 Views

The angle of elevation to the top of a tree is 63 degrees. Given that the distance to the tree is 15 m and your height is 1.6 m, how tall is the tree?

Drawing a diagram for this would show that the height of the tree above us is given by tan(63)*15, so the total height is this added to 1.6 m. This gives a height of 31 m.

Answered by Lucy V. • Maths tutor

3059 Views

A coil is connected to an analogue centre zero ammeter. A magnet is dropped (North pole first) so that it falls vertically and completely through the coil. What would be observe on the ammeter?

The ammeter's needle would first be deflected one way, then as the direction of the current reversed, it would deflect the other way.

Answered by Lucy V. • Physics tutor

3500 Views

Como ya sabes, hoy en día hay muchos problemas medioambientales. ¿Qué haces en casa para proteger al medio ambiente? ¿Piensas que los ciudadanos son resonsables para la protección del medio ambiente, o sólamente los gobiernos y las grandes empresas?

En casa reciclamos, intentamos reducir la cantidad de electricidad y agua que usamos, y evitamos usar el coche siempre que podemos (entre otras cosas). Pienso que el cambio climático es uno de los proble...

Answered by Lucy V. • Spanish tutor

1641 Views

Describe the processes in the formation of a coastline.

headlands and bays: differences in rock strength and resistance to erosion, different erosion rates = headlands and bays.cracks and caves forming from erosion, both sides of the headland.An arch forms.Roo...

Answered by Polly R. • Geography tutor

2007 Views