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Estimate the answer to: (4.28 x sqrt(99))/7.83

4.28 rounds down to 4; sqrt(99) is approximately 10; 7.83 rounds up to 8 So an appropriate estimate would be: (4x10)/8 = 40/8 = 5
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Answered by Amy T. • Maths tutor
3342 Views

-8x + 7 > 5x + 2

-13 x + 7 > 2 -13 x > -5 x < 5/13 Remember multiply or divide a number by a negative number, you switch the inequality sign
HK
Answered by Hyerim K. • Maths tutor
3470 Views

Solve 3(x-2)=21

This question can be solved in two ways. One way is to divide the whole equation, both sides by 3, which gives x-2=7. Then add 2 to both sides to give x=9. Another way is to work out the left hand side of th...
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Answered by Xuexin Y. • Maths tutor
4514 Views

How does a radioactive nucleus emit electrons when it doesn't contain any?

When a beta decay occurs there are a couple of things you need to remember. First of all you are right, the nucleus doesn't contain any electrons. It does however contain neutrons and protons. We know that p...
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Answered by Aisling C. • Physics tutor
9578 Views

Explain the importance of following the ethical guidelines set out by the British Psychological Society

The British Psychological Society ethical guidelines are to be followed for the protection of both researcher and participants within a psychological study. Providing information on areas such as informed co...
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Answered by Keira N. • Psychology tutor
3097 Views