4 years ago

Help me please!!!!!!!!

Mathematics

1 answer:

zloy xaker [14]4 years ago

7 0

Answer:

1. $4x^2 - x + 1.5$

Step-by-step explanation:

1. The prism has 6 surface faces. 2 of the surfaces are marked. The third is not. The surface area of the prism is given. Subtract the areas you know from the total surface area and divide it by 2. The result is the area of the last surface face.

$18x^2+12x+22 -(8x^2+10x+17) - (2x^2+4x+2)\\18x^2 + 12x + 22 -8x^2 -10x - 17 - 2x^2 - 4x -2\\8x^2 - 2x + 3$

Divide this in 2.

The area of the unknown face is $4x^2 - x + 1.5$

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current rules for telephone area codes allow the use of digits 2-9 for the first digit and 0-9 for the second and third digits.

lukranit [14]

In this question, there are 10 digit phone number which was divided into 3-3-4 digits. Every first digit of the division should be 2-9 which mean only 8 possibilities. The other digits would be 0-9 which mean 10 possibilities. Then the calculation would be:

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5 0

3 years ago

Can anyone help me please?

miss Akunina [59]

Answer:

5. -18x^3y^4 +54x^2y^4

6. 6x^2 -40x +50

Step-by-step explanation:

Use the distributive property. The factor outside parentheses multiplies each term inside parentheses.

$(9xy)(-2x^2y^3+6xy)=(9xy)(-2x^2y^3)+(9xy)(6xy^3)\\\\=\boxed{-18x^3y^4+54x^2y^4}$