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2x-4=6, find x.

[add 4 to both sides] 2x=10 Therefore, x=5
EW
Answered by Elena W. • Maths tutor
4913 Views

Explain the significance of atomic number and mass number in determining atomic properties. Which of these changes in isotopes?

Atomic Number: Number of Protons in the nucleus of the atom, also equal to the number of electrons in a neutral atom. Mass Number: Total number of "nucleons" (Protons and Neutrons) in the nucleus I...
JT
Answered by Joshua T. • Chemistry tutor
14089 Views

Should you structure your argument in an essay by writing one side and then the other, or write it paragraph by paragraph?

Both of these are acceptable, but I would advise writing it paragraph by paragraph, as quite often students run out of time in the exam and that way at least you've covered both sides of the argument. It als...
SB
7202 Views

solve the simultaneous equations , 5a+2b=23 & 9a-2b=19, algebraically.

find sum of both equations: 14a=42, therefore a=3, substitute 'a' into an equation: (5x3)+2b=23, therefore 2b=8, therfore b=4
RP
Answered by Rohan P. • Maths tutor
5190 Views

find f'(x) of (x^2) + 3x + 2.

2x + 3
RP
Answered by Rohan P. • Maths tutor
4363 Views