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vodka [1.7K]
3 years ago
12

[3x - 4 × 5] bằng bao nhiêu

Mathematics
1 answer:
user100 [1]3 years ago
4 0

Answer:

-60

Step-by-step explanation:

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4 years ago
How do I go about solving this. ​
notka56 [123]
<h2>Answer:</h2><h2>x=37.5° and angle ABC is 52.5°</h2><h2>Step-by-step explanation:</h2>

We know that angle CBD is a right angle.

We also know that angle ABE is 180°.

Our unknown angle values are angle DBE and angle CBA.

angle CBD minus angle ABE will be 90°.

angle ABC plus angle DBE must equal 90°.

Solving for x:

(x+15)+(x)=90°

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2x/2=75°/2

x=37.5°

Checking the work:

ABC=37.5°+15=52.5°

CBD=90°

DBE=37.5°

In conclusion, ABC plus CBD plus DBE equals 180°

<em>Hope this helped!</em>

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