I don't get this question plz help

1 answer:

andre [41]3 years ago

5 0

X is 45°
Y is 80°
Z is the difference of 180° and (80°+45°)

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Viefleur [7K]

Answer:

390cm

Step-by-step explanation:

1. find area of rectangle

1. 15cm x 20cm= 300 cm

2. find area of triangle

1. 1/2 (12 x 15)= 90cm

300+90

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273.8 cm of wood framing is needed.

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vampirchik [111]

Answer:

10980 is the correct answer

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2 years ago

vlabodo [156]

Explanation:

Conversion of a quadratic equation from standard form to vertex form is done by completing the square method.

Assume the quadratic equation to be $\mathbf{ax^{2}+bx+c=0}$ where x is the variable.

Completing the square method is as follows:

send the constant term to other side of equal $\mathbf{ax^{2}+bx=-c}$
divide the whole equation be coefficient of $\mathbf{x^{2}}$ , this will give $\mathbf{x^{2}+\frac{b}{a}x=- \frac{c}{a}}$
add $\mathbf{(\frac{b}{2a})^{2}}$ to both side of equality $\mathbf{x^{2}+2\times\frac{b}{2a}x+\frac{b}{2a}^{2}=-\frac{c}{a}+\frac{b}{2a}^{2}}$
Make one fraction on the right side and compress the expression on the left side $\mathbf{(x+\frac{b}{2a})^{2}=\frac{b^{2}-4ac}{4a^{2}}}$
rearrange the terms will give the vertex form of standard quadratic equation $\mathbf{a(x+\frac{b}{2a})^{2}-\frac{b^{2}-4ac}{4a}=0}$