Would the set 20, 25, 15 represent a right triangle

Yes

Step-by-step explanation:

Follow the rule:

a² + b² = c²

c is always the hypotenuse, or the longest side (25).

b and a are usually interchangeable.

Let:

a = 15

b = 20

c = 25

Plug in the corresponding numbers to the corresponding variables in the equation:

a² + b² = c²

(15)² + (20)² = (25)²

Simplify. First, solve the powers, then add:

225 + 400 = 625

225 + 400 = 625

625 = 625

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Yes, the set 15, 20, 25, represent a right triangle.

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25/4

step-by-step explanation:

call segment cd's length x. because dc and ab are parallel, angle acd and cab, so triangles adc and abc are similar and we can set up the equation x / ac = ac / ab, or x / 5 = 5 / 4 and x = 25/4.

c.

step-by-step explanation:

substitution for (0,1)

y=x^2+4x+1

1=0^2+4(x)0+1

1=0+4(x)0+1

1=4(x)0+1

1=0+1

1=1

substitution for (-3,-2)

y=x+1

-2=-3+1

-2=-2