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What is the perfect tense and how do you form it?

The perfect tense in Spanish translates as 'to have done something' in English. It is used to express actions that begun in the past and are carried through to the present. For example, 'Todavía no ha traído...
LR
Answered by Lexi R. • Spanish tutor
2615 Views

In an analysis of copper sulfide, 12.7g of copper was found to be combined with 3.2 g of sulfur. Calculate the empirical formula.

So, the empirical formula means the smallest value, like the lowest common denominator in maths, but instead of fractions we are going to be using chemical formulae. I always find it easiest to set it out li...
SS
Answered by Serena S. • Chemistry tutor
6623 Views

Solve the simultaneous equations: 2x+5y=25, x=y+2

using our second equation, we can see that x=y+2. Therefore we can sub x into the first equation. This will give us 2*(y+2)+5y=25. We can go ahead and expand the brackets, which gives us 2y+4+5y=25. We can c...
LW
Answered by Louis W. • Maths tutor
4504 Views

Decline the verb "to go" in the preterit tense. What other Spanish verb follows the same conjugation in this tense?

To go in Spanish is ir . It is very irregular verb so the normal rules for conjugating do not apply to it. It is easier to consider that the root for the preterit tense is fuir , although the pattern is not ...
SR
Answered by Sabela R. • Spanish tutor
4150 Views

Find a quarter of the area of a circle with a diameter of 10cm.

To find a part of the area we need the whole area first. Find the formula for the area of a circle: A= pi x r 2 We have been given the diameter so we need to work out what the radius is, half of the diameter...
JS
Answered by Joseph S. • Maths tutor
5792 Views