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What is the value of x if 2X+1: 3 = 5: 9?

The product of the inside (3 and 5) and the product of the outside (2X+1 and 9) are equal to each other. Therefore 18X+9 = 15. Therefore 18X =6 and if we divide both sides by 18, we get X=1/3.

Answered by Hosouk L. • Maths tutor

7024 Views

What is the difference between natural selection and evolution?

Evolution is the gradual change in the alleles of a species over time to make it more suited to its environment. Natural selection is when certain members of a population have an advantageous allele makin...

Answered by Hannah D. • Biology tutor

2083 Views

« L’anglais est la langue dans laquelle j’exprime le mieux la subtilité. Mais je dois dire que le français est la langue la plus proche de mon cœur ». Quelles distinctions pouvez-vous établir entre une langue maternelle et une langue seconde ?

This question aims to make the difference between a mother tongue and the other languages spoken by an individual. Here, the aim is to make the student discuss the subtlety between the different languages...

Answered by Amélia D. • French tutor

1693 Views

What is the difference between using depuis/pendant/pour in French when saying for?

Firstly, we use 'depuis' to describe an action that began in the past and continues into the present. It is formed with 'depuis' and the verb in the present tense. For example; "J'écoute de la mausiq...

Answered by Alice L. • French tutor

4667 Views

Find the gradient of the tangent to the line y=(x-2)^2 at the point that it intercepts the y-axis

First find the coordinates of the point in question:We know x=0By plugging this into the equation of the line we get y=(0-2)² = (-2)² = 4Therefore the point is (0,4)
To find the...

Answered by Alec J. • Maths tutor

3316 Views