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z = 3x + 5y, if x = 7 and z = 41, what is 2y?

z = 3x + 5y 41 = 3(7) +5y 41= 21 + 5y 20 = 5y 4 = y y = 4 2y = 8
HA
Answered by Hannah A. • Maths tutor
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How would you correctly carry out a flame test, and what colour would potassium yield, and what colour would lithium yield?

Answer First a wire loop is cleaned with diluted hydrochloric acid, which is then dipped into the sample metal or solution. This is then held over an open flame and the colour emitted is observed. The colour...
CK
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How can I solve quadratic equations by completing the square?

When we have a quadratic (ax 2 + bx + c = 0) we can "complete the square" to solve for x. For example x 2 + 8x + 7 = 0. First look at the x 2 + 8x, in particular the coefficient of x, "b"...
TB
Answered by Thomas B. • Maths tutor
4100 Views

How do I build up and retain a sufficient level of vocabulary?

The need to build up a sufficient level of vocabulary and retain it is extremely important when taking on the written and oral componants of the A level exams both when it comes to to comprehension and expre...
JE
Answered by Joshua E. • French tutor
2103 Views

How does Synaptic Transmission work?

The brain is made up of structures alled neurons, which acts processed and sends information through electircal impulses. Because neurons do not touch eachother, hese electrical impulses are sent through a g...
ZS
Answered by Zara S. • Psychology tutor
3096 Views