Top answers

Make x the subject of the equation: 2x+7=5x

Making x the subject means we must rearrange the equation to get it into the form 'x='First, we need to get all the x's on one side; to do so, we will subtract 2x from each side to give 2x+7-2x=5x-2x. This s...
SM
Answered by Safiya M. • Maths tutor
4135 Views

The coefficient of the x^3 term in the expansion of (3x + a)^4 is 216. Find the value of a.

From the binomial theorem we know that the x^3 term in the expansion of the above expression must satisfy, 4C3 * (3x)^3 * a = 216x^3. Hence, after multiplying out we must have, 108a * x^3 = 216x^3 and theref...
AB
6602 Views

An isotope of Nitrogen has an atomic number of 7 and a mass number of 15. How many electrons, neutrons, and protons does an atom of this isotope have?

Atomic number = the number of protons per atom of this isotopeMass number = total number of protons + neutrons per atom Therefore, an atom of this isotope has 7 protons and 15-7=8 neutrons. As an atom is neu...
SI
Answered by Sophie I. • Chemistry tutor
11239 Views

v^2 = 2w - x^2. w = 40; x = 4. Find the value of v.

Firstly, we can put the values given in the question into our equation.v 2 = 2w - x 2 Goes to ...v 2 = 2(40) - (4) 2 After we do the multiplication and indices, the equation looks like this.v 2 = 80 - 16Do t...
JT
Answered by Jack T. • Maths tutor
3076 Views

How do you analyse a source?

Source analysis is no easy feat but paramount to the work of any zealous historian. We are naturally inquisitive. We are detective like in our means of investigation. Yet, instead of cracking a case, we alre...
MJ
Answered by Molly J. • History tutor
2557 Views