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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
4826 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
13918 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
5102 Views

state three differences between a plant cell and animal cell.

any three from: no cell wall in animal cells/ (cellulose) cell wall in plant cell centrioles present in animal cell, not in present in plant cell (permanent) vacuole in plant cell, lack of (permanent) vacuol...
RP
Answered by Rohan P. • Biology tutor
11635 Views

Adam is going to get a loan of £ 720 to help pay for the holiday. Adam will have to pay back the £ 720 plus interest of 15 %. He will pay this back in 12 equal monthly installments. How much money will Adam pay back each month?

From the question, we learn that Adam has take out a loan of £720. He will be paying back the loan in 12 monthly installments of the same amount each time. We are also told he must pay the loan back with 15%...
RC
Answered by Riaz C. • Maths tutor
5475 Views