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Mathematics

2 answers:

Brrunno [24]4 years ago

8 0

= 40 - 56i + 65i - 91i^2
= 40 + 9i + 91
= 131 + 9i

answer is D. 131 + 9i

yuradex [85]4 years ago

4 0

Its simple foil

(5-7i)(8+13i)

you should know i^2=-1

=40+65i-56i-91i^2
=131+9i

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Harrizon [31]

Answer:

x = 437.3 ft

Step-by-step explanation:

Right Triangles

In right triangles, where one of its internal angles measures 90°, the trigonometric ratios are satisfied.

We have completed the figure below with the missing internal angle A that measures A = 90° - 29° = 61° because the lines marked with an arrow are parallel.

Given the internal angle A, we can relate the unknown side of length x with the known side length of 500 ft, the hypotenuse of the triangle. We use the sine ratio:

$\displaystyle \sin 61^\circ=\frac{\text{opposite leg}}{\text{hypotenuse}}$