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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
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Answered by Rohan P. • Maths tutor
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find f'(x) of (x^2) + 3x + 2.

2x + 3
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Answered by Rohan P. • Maths tutor
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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...
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Answered by Rohan P. • Biology tutor
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how is a proton gradient set up and maintained across the inner mitochondrial membrane?

H+ ions and electrons released from NADH and FADH2,on to the inner mitochondrial membrane. electrons enter electron transport chain, and energy released from transfer of electrons is used to pump H+ ions int...
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Answered by Rohan P. • Biology tutor
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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%...
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Answered by Riaz C. • Maths tutor
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