9947 GCSE questions

Make x the subject of the formula: x/2 + 3 = y - 2

To make x the subject of the formula, we simply want to have x on its own on one side of the equals sign. So we need to remove any numbers on the same side as x. Everything we do to the left hand side we must also do exactly the same to the right hand side. Firstly, we want to remove the 3 on the left hand side, so subtract 3 from both sides to give: x/2 + 3 - 3 = y - 2 -3 which is x/2 = y - 5. Now we want to remove the divide by 2 on the left hand side so we need to do the opposite of division which is multiplication. So we multiply both sides by 2 to give: x = (y - 5)*2. We use the brackets as both y and -5 are multiplied by 2. Expanding the brackets then gives usx = 2y - 10
See more
Katie L.

2 hours ago

Answered by Katie, Maths GCSE tutor with MyTutor

0 views

When working with probabilities why is it sometimes necessary to add and sometimes to multiply?

Whether you need to add or multiply depends on whether it is a case of 'AND' or 'OR'. For 'AND' you multiply, and for 'OR' you add. Below are examples of each case, using dice as an example:
To calculate the probability that I get a six on my first roll AND get a five on my second roll, I need to multiply: 1/6 x 1/6 = 1/36
To calculate the probability that I get either a six OR a five on my first roll, I need to add: 1/6 + 1/6 = 2/6 = 1/3





See more
Marcus W.

3 hours ago

Answered by Marcus, Maths GCSE tutor with MyTutor

0 views

Factorise X^2 + 13x + 42; from this, please give the answer to X^2 + 13x + 42 = 0

This question aims to look at quadratic equations. We factorise Quadratic equations into two sets of bracketsFirst, we are dealing with X2. X2 is formed from X multipled by X, so each bracket should contain one X --> (X+?) (X+?)The aim here is to find two numbers which add up together to give 13 and Multiply to give a product of 42. Considering the sum of the numbers is not large, this means the numbers themselves are not large too!Thinking about which numbers Multiply to give 42 --> 1 x 42, 2 x 21, 3 x 14, 6 x 7Now look above, which numbers above give a sum of 13? --> 6 & 7!This means (X+6) (X+7) --> X2 + 13x + 42Now if we make this equation equal to 0 --> (X+6) (X+7) = 0; here we get two answers --> X is either -6 or -7We can try putting either one of these numbers in the place of X and find the answer will be equal to 0, Try it out!

See more
Khalid A.

3 hours ago

Answered by Khalid, Maths GCSE tutor with MyTutor

0 views

Factorise X^2 + 13x + 42; from this, please give the answer to X^2 + 13x + 42 = 0

This question aims to look at quadratic equations. We factorise Quadratic equations into two sets of bracketsFirst, we are dealing with X2. X2 is formed from X multipled by X, so each bracket should contain one X --> (X+?) (X+?)The aim here is to find two numbers which add up together to give 13 and Multiply to give a product of 42. Considering the sum of the numbers is not large, this means the numbers themselves are not large too!Thinking about which numbers Multiply to give 42 --> 1 x 42, 2 x 21, 3 x 14, 6 x 7Now look above, which numbers above give a sum of 13? --> 6 & 7!This means (X+6) (X+7) --> X2 + 13x + 42Now if we make this equation equal to 0 --> (X+6) (X+7) = 0; here we get two answers --> X is either -6 or -7We can try putting either one of these numbers in the place of X and find the answer will be equal to 0, Try it out!

See more
Khalid A.

4 hours ago

Answered by Khalid, Maths GCSE tutor with MyTutor

0 views

Use factorisation to simplify the following expression (x^2-9)/(x^2-4x+3)

we simplify the top and bottom of the fraction separately.
x^2-9 factorises to (x+3)(x-3) using the difference of two squares.
x^2-4x+3 factorises to (x-1)(x-3).
So the above formula simplifies to (x+3)/(x-1)

See more
Jack L.

5 hours ago

Answered by Jack, Maths GCSE tutor with MyTutor

0 views

Describe the lytic pathway of a virus.

The lytic cycle is one of the two cycles of viral reproduction in host cells. 
Viruses cannot replicate outside a host, therefore virus binds to host cells. Adsorption and penetration occurs (process through which virus inserts genetic material (DNA/RNA) into the host cell. Cellular machinery are used to replicate viral gene and produce more viral genes and proteins. 
The components assemble into new viral particles. The newly formed viruses can exit the cell either via the host cell membrane or lysis of the host cell. These viruses can further undergo reproduction in other host cells, resulting in more virus particles. Thus, can spreading infection.
See more
Nisha G.

5 hours ago

Answered by Nisha, Biology GCSE tutor with MyTutor

0 views

Define an isotope.

Compounds with the same molecular formula but have different structural formulas.
See more
Shivani S.

6 hours ago

Answered by Shivani, who has applied to tutor Chemistry GCSE with MyTutor

0 views

Solve 3(2y - 1) = 6

Expand bracket 6y - 3 = 6
Collect like terms6y = 6 + 36y = 9y = 9/6
Simplify answer y = 3/2 (1.5)
See more
Shivani S.

6 hours ago

Answered by Shivani, who has applied to tutor Maths GCSE with MyTutor

0 views

Use factorisation to simplify the following expression (x^2-9)/(x^2-4x+3)

we simplify the top and bottom of the fraction separately.
x^2-9 factorises to (x+3)(x-3) using the difference of two squares.
x^2-4x+3 factorises to (x-1)(x-3).
So the above formula simplifies to (x+3)/(x-1)

See more
Jack L.

6 hours ago

Answered by Jack, Maths GCSE tutor with MyTutor

0 views

Factorise X^2 + 13x + 42; from this, please give the answer to X^2 + 13x + 42 = 0

This question aims to look at quadratic equations. We factorise Quadratic equations into two sets of bracketsFirst, we are dealing with X2. X2 is formed from X multipled by X, so each bracket should contain one X --> (X+?) (X+?)The aim here is to find two numbers which add up together to give 13 and Multiply to give a product of 42. Considering the sum of the numbers is not large, this means the numbers themselves are not large too!Thinking about which numbers Multiply to give 42 --> 1 x 42, 2 x 21, 3 x 14, 6 x 7Now look above, which numbers above give a sum of 13? --> 6 & 7!This means (X+6) (X+7) --> X2 + 13x + 42Now if we make this equation equal to 0 --> (X+6) (X+7) = 0; here we get two answers --> X is either -6 or -7We can try putting either one of these numbers in the place of X and find the answer will be equal to 0, Try it out!

See more
Khalid A.

7 hours ago

Answered by Khalid, Maths GCSE tutor with MyTutor

0 views
Need help with school?
Boost your grades with stress-free tuition that fits your schedule.

Your difficult questions, answered

Our tutors get asked all sorts of hard questions in their Online Lessons. They use this page to write up the most common questions so you can access them for free.

Wondering how MyTutor works?

Here's a two minute explanation.

FREQUENTLY ASKED QUESTIONS

How do we connect with a tutor?

Who are the tutors?

How much does tuition cost?

How do Online Lessons work?

How it works

mtw:mercury1:status:ok