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Make t the subject of this equation: x=4t-7

x=4t-7 take the -7 over first, swapping the sign as it passes over the equals sign x+7=4t 4t = 4*t so we need to divide the other side of the equation by 4 1/4(x+7)=t
LC
Answered by Louise C. • Maths tutor
3790 Views

Find the value of x in the equation x^2 - 2x + 1 = 0

Factorise: X^2 means 2 brackets (x )(x )=0 factors of 1 = 1 (x 1)(x 1)=0 to get minus 2 you must do (-1) + (-1) so (x-1)(x-1)=0 therefore x-1=0 and x=1
LC
Answered by Louise C. • Maths tutor
4265 Views

When should you use the passé simple instead of the imparfait?

The "passé simple" is most often used in literary and formal writing express a completed past action. E.g. Un jour, elle tomba malade. (one day, she fell ill) The "imparfait" on the other...
AV
Answered by Annabel V. • French tutor
3341 Views

A student cut a piece of potato into 10 discs, each 1mm thick and with a 10mm diameter. He then placed them in a beaker of deionised water. After a couple of days, they had increased in size- both thickness and diameter. Explain why this is the case.

The cells composing the potato tissue contain fluid, or cytoplasm. This contains dissolved salts and these ions attract water molecules; cations, or positive ions, attract the partially negatively charged ox...
EK
Answered by Eva K. • Biology tutor
3579 Views

How can I describe events in the future?

In English, we have 'I am going' + infinitive, for example, I am going to eat. This can describe an event in the near future. Then, we have the term "will" for talking about a future that is more d...
JK
Answered by Julia K. • Italian tutor
3905 Views