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krok68 [10]
3 years ago
15

Find the value of x A. 11.67° B. 42.5° C.18° D.20°

Mathematics
2 answers:
Julli [10]3 years ago
7 0

Answer:

D. 20°

Step-by-step explanation:

The entire angle = 90 degrees you can tell that from the corner indicator

Set the two expressions equal to 90

(3x+10) + (x) = 90

Combine like terms

4x + 10 = 90

Subtract 10 from both sides to cancel it out

4x = 80

Divide each side by 4

x = 20

Check it by substituting x for 20

3(20) + 10 = 70     x = 20     70 + 20 = 90

Paha777 [63]3 years ago
7 0

Answer:

D. 20degrees

Step-by-step explanation:

This is a Complementary Angle so it will equal 90.

3x + 10 + x = 90

4x + 10 = 90

90 - 10

= 80

4x = 80

80 / 4

x = 20

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