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A man stands 9 metres from the base of a tree. He knows the distance from where he is standing and the top of the tree is 15 metres. How tall is the tree?

a 2 + b 2 = c 2 a : 9 b : unknown c: 15 b 2 =c 2 - a 2 so b 2 = 225 - 81 =144 so b=12
JM
Answered by Jack M. • Maths tutor
3809 Views

Describe and Explain one or more landforms produced by coastal depositon:

Material is deposited by constructive waves when waves no longer have enough energy to transport the material or there is an increase in the amount of eroded material being carried leading to the formation o...
PM
Answered by Polly M. • Geography tutor
5592 Views

The mean of 5 numbers is 42. The 5 numbers are 45,29,63,42 and X. Find the value of X.

42 x 5 = 210. 45+29+63+42 = 179. 210 - 179 = 31 X = 31
JF
Answered by Joseph F. • Maths tutor
5313 Views

How do you know when to use the imperfect tense and the preterite tense?

There are two simple past tenses in Spanish: the imperfect and the preterite tenses. The imperfect tense is used to describe continuous past actions, something which used to happen or to describe what someth...
KD
Answered by Kieran D. • Spanish tutor
2567 Views

Express 3x^2+18x-1 in the form a(x+b)^2 +c

3x^2+18x-1 Bracket out 3x^2+18x Factorise by bringing out the common factor of 3 = 3(x^2+6x) Divide the x coefficient by 2 = 3(x^2+3x) And then remove the square on the x^2 variable and add a square to the o...
CO
Answered by Chukwudi O. • Maths tutor
14686 Views