Question

Please answer either or all of them and please show me how you solve it

Answer 1

Explanation:

using pythagoras theorem

a^2 + b^2 = c^2

4^2 + y^2 = 21^2

16 + y^2 = 441

y^2 = 441 - 16

y^2 = 425

`y = √(425)`

`y = 5√(17)`

y = 13.2

a^2 + b^2 = c^2

4^2 + x^2 = 7^2

16 + x^2 = 49

x^2 = 40 - 16

x^2 = 33

x =
`√(33)`

x = 5.7 m