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Texto: Según el antiguo empresario y actual presidente Donald Drumpf, muchos de los problemas a los que se enfrentan los estadounidenses acabarán cuando se construya un “gran y hermoso muro” en la fronter...

Answered by Marta R. • Spanish tutor

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A compound is found to contain 37.21% carbon, 7.75% hydrogen and 55.04% chlorine. What is it's empirical formula?

Carbon: 37.21/12= 3.1Hydrogen:7.75/1=7.75Chlorine: 55.04/35.5=1.55Ratio:c:H:Cl3.1:7.75:1.552:5:1Therefore empirical formula= C₂H₅Cl

Answered by Lucy P. • Chemistry tutor

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Expand the following expression and simplify: (3x+2)(4x+5)

12x² + 15x + 8x + 10 = 12x² + 23x + 10

Answered by Priscilla D. • Maths tutor

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A car depreciates at 8% per year. The initial price of the car is £25,000. How much will the car be worth after 4 years? After how many years will the car be worth less than £14,000?

This problem is all about compound interest except this time the value is going down not up. To increase a value by 8% you would multiply it by 1.08 as 8% is 0.08 (1+0.08). To decrease a value however you...

Answered by Hannah T. • Maths tutor

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The formula v = u +at gives the final velocity of an object as it accelerates. If v= 35, a=4 and t=5 then find u

First off, you would start by substituting in the numbers that you already know.
Therefore you get: 35 = u + (4 x 5)
Remembering BODMAS you would then look at the equation and solve the bracket...

Answered by Hannah G. • Maths tutor

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