Find a (geometry) plz help

Answer and Step-by-step explanation:

We are given:

A side length of 7

An angle of 30.

We will use trigonometric functions to solve for a.

We will use the sine trig function.

Multiply a by both sides, then divide by sin30 on both sides.

Now, use a calculator and do 7 divided by sin of 30.

We get a to be:

14

a is equal to 14

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a = 14

Step-by-step explanation:

we know,

sin 30° = 1/2

sin 30° = 7 / a ( perpendicular / hypotenuse )

so,

equating both equations we get,

=》

=》

=》

i hope it helped...

hello :

by applying the distributive property :

6 × 4.3 = 6 × ( 4 + 0.3 )

            =   (6 ×   4) + (6 ×   0.3)

            = 24 + 1.8

6 × 4.3 = 25.8

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.