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A quarter circle has a radius of 8, calculate the area giving your answer in terms of pi

area of a circle = pi x radius^2 64pi/4 = 16pi Student must be aware of the equation for the area of a circle and that they must divide by 4 to get the answer here
SD
Answered by Sam D. • Maths tutor
8336 Views

A zinc chloride solution (ZnCl2) is prepared by reacting zinc carbonate with dilute hydrochloric acid, write the balanced equation for this reaction

ZnCO3 + 2HCl --> ZnCl2 + H2O + CO2 Student must be aware of the formula for a carbonate (CO3) and how to balance the equation. I leave the balancing to the end to make sure I have written the equation cor...
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Answered by Sam D. • Chemistry tutor
8971 Views

2435 units of gas used in November, costing 4.12p per unit. The gas company also charge 9.43p per day. The total cost has an additional 5% in VAT. What is the gas bill for the month of November?

30 days in November; (30 X 9.43) = 282.9p (2435 X 4.12) = 10032.2p (10032.2 + 282.9) = 10315.1p 5% in VAT so total price is 105% of 10032.2p Convert 105% to decimal; 1.05 (1.05 X 10315.1) = 10830.55p Convert...
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Answered by Andrew G. • Maths tutor
3825 Views

Solve the simultaneous equations: [4x-y=3] and [6x +2y=1]

(1) 4x-y=3(2) 6x+2y=1Eliminate y; (1) X 2 => (3) 8x-2y=6 Add (2) to (3) 8x - 2y = 6 +(6x + 2y) = 114x = 7x=1/2 If x=1/2 then,2-y=3 y= -1
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Answered by Andrew G. • Maths tutor
4652 Views

Give an example of ionising radiation

gamma, beta, ultraviolet
RC
Answered by Rocio C. • Physics tutor
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