sin D = 4/5 sin C = 3/5 sin D x cos D = 12/25 cos C x tan D = 16/15 Step-by-step explanation: sin x = opposite/hypotenuse cos x = adjacent/hypotenuse tan x = opposite/adjacent then sin D = 4/5 sin C = 3/5 sin D x cos D = 4/5 x 3/5 = 12/25 cos C x tan D = 4/5 * 4/3 = 16/15

A-2, B-DNE*, C-3, D-DNE, E-4, F-1

The first attachment shows the solutions to A and C.

The second attachment shows the solutions to E and F.

There are no real number solutions to systems B and D.

In general, you can solve the linear equation for y, then substitute that into the quadratic. You can subtract the x-term on the left and complete the square to find the solutions.

A.

(3-x) +12 = x^2 +x

15 = x^2 + 2x

16 = x^2 +2x +1 = (x +1)^2 . . . . add the square of half the x-coefficient to complete the square; next take the square root

±4 -1 = x = {-5, 3) . . . . . identifies the second solution set for system A

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B.

(x -1) -15 = x^2 +4x

-16 = x^2 +3x

-13.75 = x^2 +3x +2.25 = (x +1.5)^2

roots are complex: -1.5 ±i√13.75

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C.

(1-2x) +5 = x^2 -3x

6 = x^2 -x

6.25 = x^2 -x + .25 = (x -.5)^2

±2.5 +.5 = x = {-2, 3} . . . . . identifies the third solution set for system C

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remaining problems are done in a similar way.

* DNE = does not exist. There is no matching solution set for the complex numbers that are the solutions to this. Hope this helps! Brainliest would be great! With all care, 07×12!

Answer 6

Step-by-step explanation:

Sin D = 4/5 Sin C = 3/5 Sin D x Cos D = 12/25 Tan C x Tan D = 1 Cos C x Tan D = 16/15

Answer 7

The ratios are as follows: Step-by-step explanation: The trignometric ratio are defined as follows: where opposite side is the side opposite to angle theta and and adjacent side the side which is adjacent to angle θ and hypotenuse is the hypotenuse of the right angled triangle. and Hence, from the right angled triangle that is provided to us we have: and and Hence, and

SOH CAH TOA: sinθ = opp/hyp, cosθ = adj/hyp, tanθ = opp/adj So we go through all of the values: sinD = ⁴/₅ sinC = ³/₅ sinD * cosD = ⁴/₅ * ³/₅ = ¹²/₂₅ tanC * tanD = ³/₄ * ⁴/₃ = 1 –> Doesn’t match with anything cosC * tan D = ⁴/₅ * ⁴/₃ = ¹⁶/₁₅

sin C – 3/5This is basically the same reason as sin D, however this time the Opposite is 3. sin D × cos D – 4/5 × 3/5 = 12/25For here, you just get the fractions of sin D, which we got earlier, and cos D, which would be Adjacent/Hypotenuse and therefore 3/5. tan C × tan D – Not an option cos C × tan D – 16/15This is because cos C would be 4/5, and tan D would be 4/3 (Opposite/Adjacent) and multiplying those fractions together gives 16/15. I hope this helps!

Answer 6

Step-by-step explanation:

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