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Give one example of perfect and imperfect substitutes.

Perfect substitute could be anything like: Pepsi and Coca-Cola, PG Tips and Typhoo etc. Imperfect substitute can be things like: Tea and Coffee, Beer and Wine.

Answered by Christopher L. • Economics tutor

17381 Views

There are 892 litres of oil in Mr Aston’s oil tank. He uses 18.7 litres of oil each day. Estimate the number of days it will take him to use all the oil in the tank.

Estimate, so: 900 litres, and 20 litres per day. 900/20 = 45 However, any estimation that results in an answer between 44-56 is acceptable.

Answered by Christopher L. • Maths tutor

9494 Views

This exam seems different from the style of A-level English, how best should I prepare for this exam?

Everyone learns differently, but for the ELAT I would suggest a few things as key to anyone's preparation. First and foremost it is important to make sure you are comfortable with unseen passages, and ana...

Answered by TERESA R. • ELAT tutor

2374 Views

Rearrange "(6y-30)/5 = 2x+(12/5)" so it reads "y = ... ". Sketch this line and label where it meets the axes.

multiply everything by 5, so you get 6y - 30 = 10x + 12 - add 30 to both sides, so you get 6y = 10x + 42 - divide everything by 6, so you have y = (10/6)x + (42/6) - simplify, y= (5/3)x + 7 - this i...

Answered by Tegan H. • Maths tutor

3249 Views

Differentiate with respect to x y=(x^3)ln2x

To be able to differentiate this we need to use the product rule as we want to differentiate two functions multiplied together. The product rule states that if y=uv, then : dy/dx= u dv/dx + v du/dx. Let u...

Answered by Jennifer P. • Maths tutor

12419 Views