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A family go into a shop, they buy three sandwiches and two packets of crisps. It costs them £9. Another family buy five sandwiches and six packets of crisps. It costs them £19. How much does two sandwiches and five packets of crisps cost?

We will call sandwiches S and packets of crisps C. These are the 'unknowns'. From the information we can write down two equations. Equation 1: 3S + 2C = 9 and Equation 2: 5S + 6C = 19. We need two equatio...

Answered by Nicholas W. • Maths tutor

3139 Views

Describe the process of natural selection

A mutation occurs in the genotype of an organism. This results in a beneficial phenotype being expressed. This organism now has a survival advantage. Therefore, it will live longer. This means it will hav...

Answered by Katherine O. • Biology tutor

2516 Views

Describe the process of DNA replication

DNA replication is semi-conservative, meaning existing strands are used as templates for new strands. The DNA is separated (unwinds) by the enzyme helicase. This enzyme breaks the H bonds between nucleoti...

Answered by Katherine O. • Biology tutor

2682 Views

Line A is parallel to the line 4y+12x=24. Find the equation of Line A if it passes through the point (5,40/3).

Line A and line 4y+12x+24 are parallel. This means that they have the same gradient. In y=mx+c the gradient of the line is m. We can rearrange the equation 4y+12x+24 to find m. To begin with subtract 12x...

Answered by Chloe B. • Maths tutor

3109 Views

Complete a seguinte frase, utilizando o pretérito mais-que-perfeito composto: Quando começou a chover, eu já __________ (ir) com o cão à rua.

Quando começou a chover, eu já tinha ido com o cão à rua.This verb tense shows that the action described by the verb happened before another. In this case, I had already walked my dog when it sta...

Answered by Fatima C. • Portuguese tutor

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