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What's the difference between "estar" and "ser"? (Both of them mean "to be")

“ Ser ” is used to describe permanent or long lasting qualities. It is also used to talk about date and time.Hoy es lunes, son las 12.30 = Today is Monday, it’s 12.20Examples:Laura es alta = Laura is tall (t...
SG
Answered by Sofia G. • Spanish tutor
2532 Views

Explain why the number of organisms decreases along the food chain.

Not all energy is transferred between different levels of the food chain due to not all the organisms being consumed, often not the entire organism is eaten either, leaving behind energy in the hair/fur, tee...
JG
Answered by James G. • Biology tutor
14487 Views

What is the First Law of Thermodynamics?

The First Law of Thermodynamics is that energy cannot be created or destroyed, it can only change from one form to another. For example, a boulder perched at the top of a hill has gravitational potential ene...
JD
Answered by Jade D. • Chemistry tutor
2911 Views

Express 1/(1+2x)(1-x) in partial fractions

1/(1+2x)(1-x)=(A/(1+2x))+(B/(1-x))1=A(1-x)+B(1+2x) Now set the bracket of one of A or B equal to 0 to get an equation with 1 unknown.Set x=11=A(1-1)+B(1+2(1))1=A(0)+B(3)1=3BB=1/3Set x=-(1/2)1=A(1-(-1/2))+B(1...
LC
Answered by Luke C. • Maths tutor
4668 Views

Solve the simultaneous equations: 3x + y = -4 and 3x - 4y = 6

First subtract the first equation from the second getting:0 - 5y = 10-5y = 10Then divide both sides by (-5)y = -2Then substitute the y value of (-2) back into the first equation giving:3x + (-2) = -43x = -2x...
LC
Answered by Luke C. • Maths tutor
6241 Views