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Yuri [45]
3 years ago
15

Which strategy can be used to multiply 6 x 198 mentally?

Mathematics
1 answer:
djverab [1.8K]3 years ago
8 0
The box method or latitude or longitude.
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Step-by-step explanation:

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Answer: 346.4

Step-by-step explanation:

The whole triangle ABD is a 30-60-90 right triangle. In 30-60-90 triangles, the smallest side is x, the middle side is x\sqrt{3}, and the largest side/hypotenuse is 2x.

Side AB is the smallest side and therefore x=300. Side BD is the middle side and so we can use x\sqrt{3} and we get BD=300\sqrt{3}=519.615

The question is asking for CD, and we know that CD can be equal to BD minus BC since that would isolate CD

Triangle ABC is also a 30-60-90 triangle but the 300 feet is the middle side in this triangle. So we can do 300=x\sqrt{3} and divide 300 by radical 3 and get that x=173.205

Side BC is the smallest side of this triangle so it would be x and x is 173.205.

Now that we have the whole side BD and the part of it BC. We can subtract BD by BC (519.615-173.205) and we get that CD=346.4

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2 years ago
How many grams are in 40 hectograms? 400 4,000 40,000 400,000
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Wewaii [24]

Answer:

option A : about 2.8 units

Step-by-step explanation:

To find the distance from P to RQ , Find the distance from ( 1 , 1) to (3 , 3).

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