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Liono4ka [1.6K]
3 years ago
5

Need help with #18 pls

Mathematics
1 answer:
tigry1 [53]3 years ago
4 0

your answer would be 25 steps

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Evaluate using suitable property. Write the needed steps. Use proper brackets.<br> 20 x 399 x 5
Reil [10]

Step-by-step explanation:

20 x 399 x 5

= (20×5) × 399

= 100×399

= 39,900

6 0
3 years ago
Please help me with this geometry question
mixer [17]

Answer:

180+18\sqrt{3}\ in^2.

Step-by-step explanation:

The surface area of right triangular prism is the sum of area of two base triangles and 3 area of side rectangles.

The area of base triangle is

A_{base}=\dfrac{a^2\sqrt{3}}{4},

where a is the length of the side of equilateral triangle. In your case, a=6 inches. Thus,

A_{base}=\dfrac{6^2\cdot\sqrt{3}}{4}=9\sqrt{3}\ in^2.

The area of side rectangle is

A_{side}=ah,

where h is the height of the rectangle. In your case, h=10 inches. Thus,

A_{side}=6\cdot 10=60\ in^2.

Hence, the surface area is

SA=2\cdot 9\sqrt{3}+3\cdot 60=180+18\sqrt{3}\ in^2.

6 0
3 years ago
A recipe calls for milk, flour and sugar in a ratio of 3: 5: 6. How much flour and milk would be needed if you need 4 cups of su
OverLord2011 [107]

Answer:

Milk: 2 cups

Flour: 5 cups

Sugar: 4 cups

Step-by-step explanation:

(First divide all ingredients by 2)

Milk: 3 -> 1.5

Flour: 5 -> 2.5

Sugar: 6 -> 3

(Next, multiply all by 4)

Milk: 1.5 -> 6

Flour: 2.5 -> 10

Sugar: 3 -> 12

(Divide by 3)

Milk: 6 -> 2

Flour: 10 -> 5

Sugar: 12 -> 4

5 0
3 years ago
Please help me I don't know how to do this
dem82 [27]
To find ten percent, you divide by ten. Then multiply that answer by five to get fifty percent. Subtract that answer from the original price. But because this one is fifth you could just divide by two.
5 0
3 years ago
Read 2 more answers
Plz help me number 3
icang [17]

Yes, yes, no

...........

3 0
3 years ago
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