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Given that x : y = 7 : 4 and x + y = 88, calculate x - y.

From x : y = 7 : 4 work out an expression for x: x = y (7/4) and substitute into x + y = 88: y(7/4 + 1) = 88y( 11/4) = 88 y = 88 (4/11) = 8 x 4 = 24substitute this into x + y = 88 to get x = 88 - 24 = 64....

TD
Answered by Tutor157746 D. • Maths tutor
3871 Views

What mass of calcium carbonate would you need to react with dilute hydrochloric acid to produce 10 g calcium chloride?

Equation: CaCO3 + 2HCl --> CaCl2 + CO2 + H2O [Ca40.1 C12 O16 Cl35.5]ANSWER: 9.1 g

SH
Answered by Sam H. • Chemistry tutor
3341 Views

Can you describe the gross external structure of the kidney?

Gross Structure of the Kidney: The urinary system of the human body consists of two kidneys, one left and one right. Continuing from the kidneys are two

AM
Answered by Anganile M. • Biology tutor
3041 Views

How does an increase in temperature affect the rate of a reaction?

Increasing the temperature of a reaction means increasing the kinetic energy of each particle in the reaction. Increasing a particle's kinetic energy means the particle is moving faster ('Kinetic' indicat...

KW
4052 Views

Solve the simultaneous equations 2x + 7y = 15 and 3x + 6y = 21

Find the lowest common multiple of 2 and 3, which is 6. Multiply each term in the first equation by 3, and each term in the second equation by 2 to produce two equations with the same coefficient of x (wh...

IR
Answered by Isobel R. • Maths tutor
3675 Views

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