abdubasheer abdubasheer

20-11-2017
Mathematics

contestada

Solve for x and y. Round to the nearest tenth if necessary.

A.
x=30, y=6.4

B.
x=15, y=7.2

C.
x=15, y=6.4

D.
x=30, y=8.1

Solve for x and y Round to the nearest tenth if necessary A x30 y64 B x15 y72 C x15 y64 D x30 y81 class=

Respuesta :

wolf1728 wolf1728

20-11-2017

4x + 2x = 90
x = 15

Tan (AngleA = 60) = y / 5
y = 1.7321 * 5
y = 8.6603

It seems the answer is D (though y = 8.66 and NOT 8.1)

DOUBLE-CHECK
That is a 30 60 90 triangle and 2 * shrt side = long side (AB)
so, y^2 = 10^2 -5^2
y^2 = 75
y = 8.66

So, it seems the answer is D

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