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Margaret [11]
2 years ago
6

Can anyone solve this?

Mathematics
1 answer:
Pachacha [2.7K]2 years ago
3 0
Diameter = 2 * radius

1 nickel diameter = 2* 0.4 = 0.8

3 nickel diameter = 3* 0.8 = 2.4

B 2.4
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What is the positive solution to the equation 0 = –x2 + 2x + 1?
Annette [7]

The equation 0=-x^2+2x+1 is equivalent to the equation x^2-2x-1=0.

Solve this equation:

1. D=b^2-4ac=(-2)^2-4\cdot 1\cdot (-1)=4+4=8.

2. \sqrt{D}=\sqrt{8}=2\sqrt{2}.

3.

x_1=\dfrac{-b+\sqrt{D}}{2a}=\dfrac{2+2\sqrt{2}}{2}=1+\sqrt{2}

and

x_2=\dfrac{-b-\sqrt{D}}{2a}=\dfrac{2-2\sqrt{2}}{2}=1-\sqrt{2}.

4. Since \sqrt{2}>1, you have that 1-\sqrt{2}

Answer: the positive solution is x=1+\sqrt{2}.

7 0
3 years ago
please please please please help what is the area of trapezoid ABCD enter your answer as a decimal or whole number do not round
ikadub [295]

Answer:

A = 62.5

Step-by-step explanation:

I would break this up into two easier cases. the square at the top where three vertices are A,B, and C. and then the triangle for the rest of the area. we can use the distance formula to find the side length of the square.

sqrt((y2-y1)^2 + (x2-x1)^2)

sqrt((5-2)^2 + (-1-3)^2)

sqrt(3^2 + (-4)^2)

sqrt(9 + 16)

sqrt ( 25)

5

so the area of the square is 5^2 =25

now for the triangle. the formula for the area of a triangle is (1/2)bh.

so we can plug in our b=5, but we need to find h.

we use the distance formula between point A and D to find the distance to be 20, but we have to subtract the 5 we already counted in the area of the square. so the height is 15.

so The triangle has area (1/2)×5×15

37.5.

add the two areas together and we get our answer

25+37.5 = 62.5

5 0
4 years ago
derek has 2 boxes of fruit snacks there are 12 fruit snacks in each box if he eats 6 fruit snacks each day how many days will th
jeyben [28]
Frist you need to multiply 2x12 =24 and than you need to divide 6 and 24 to get your answer. which is 4.
7 0
3 years ago
Read 2 more answers
PLEASEE HELPP MEEE I NEED HELPPPP FASTTT!!
Mamont248 [21]

Answer:

117 degrees

Step-by-step explanation:

it has to equal 180 degrees

6 0
3 years ago
Solve the problem.<br> If sin = 1/4, find csc .<br> A) 3/4<br> B) -1/4<br> C) 4<br> D) undefined
alisha [4.7K]

Answer:

C) 4

Step-by-step explanation:

By definition, cosecant (csc) is the reciprocal of sine (sin). The reciprocal of 1/4 is equal to C) 4.

4 0
3 years ago
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