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3 years ago

Solve for x Substitute in What kind of angle!!

Mathematics

2 answers:

scoundrel [369]3 years ago

7 0

A straight line is 180°. 180°-135°=55°, so x=55°, which is an acute angle because it is less than 90°.

Nikolay [14]3 years ago

7 0

X is actually 45.. still an acute angle

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mel-nik [20]

1, 3, 3, 4, 5, 6, each x is one of each number below

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2 years ago

Surface area help plz

lana [24]

Answer:

486 mm

Step-by-step explanation:

solve each side on it's own first

First 2 rectangles: 288 mm all together

2 rectangle: 144 mm

Triangles: 54 mm

Then add rectangles and triangles:

288 mm + 144 mm + 54 mm = 486 mm

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2 years ago

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joja [24]

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3 years ago

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balu736 [363]

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Step-by-step explanation:

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2 years ago

Sergey is solving 5x2 + 20% – 7 = 0. Which steps could he use to solve the quadratic equation by completing the

Mrac [35]

Answer:

$5(x^2+4x)=7$

$5(x^2+4x+4)=7+20$

$(x+2)=\pm\sqrt{\frac{27}{5}}$

Step-by-step explanation:

we have

$5x^2+20x-7=0$

step 1

Group terms that contain the same variable, and move the constant to the opposite side of the equation

$5x^2+20x=7$

step 2

Factor 5 left side

$5(x^2+4x)=7$

step 3

Complete the square

$5(x^2+4x+2^2)=7+2^2(5)$

$5(x^2+4x+4)=7+20$

$5(x^2+4x+4)=27$

step 4

Rewrite as perfect squares

$5(x+2)^2=27$

step 5

$(x+2)^2=\frac{27}{5}$

$(x+2)=\pm\sqrt{\frac{27}{5}}$

$(x+2)=\pm\frac{3\sqrt{15}}{5}$

step 6

$x=-2\pm\frac{3\sqrt{15}}{5}$

6 0

3 years ago

Read 2 more answers