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How can I prove that an angle in a semi-circle is always 90 degrees?

If we take the diameter of a circle and create an angle on the circumference at point C of the circle from the two points where the diameter meets the circumference (points A and B), the angle created will a...
DW
Answered by David W. • Maths tutor
5332 Views

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
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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
6517 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
4392 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
4034 Views