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kkurt [141]
3 years ago
7

write a variable expression that represents the word problem. gisele gave d dimes and n nickles to her brother. which expression

represents the amount in dollars that gisele gave to her brother? (0.10 0.05) • nd 0.10d 0.05n d • n d n
Mathematics
1 answer:
Alika [10]3 years ago
7 0
<span> 0.10d 0.05n 
This is correct because a dime is  10 cents and a nickel is 5 cents. You are multiplying the amount of coins by the face value of the coin. </span>
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Find constants a , b, and c such that the function
n200080 [17]

Answer: a = -2, b = -2, c = 1.

Step-by-step explanation:

We know that:

y = a*x^2 + b*x + c.

Then:

y' = 2*a*x + b

y'' = 2*a.

Then we can write the equation:

y′′ + y′ − 2y = 4x^2.

as:

2*a + 2*a*x + b - 2*(a*x^2 + b*x + c) = 4*x^2

To solve this, the first step is moving all the terms to the same side:

2*a + 2*a*x + b - 2*a*x^2 - 2*b*x - 2*c - 4*x^2 = 0

Now let's group terms with the same power of x.

(-4 - 2*a)*x^2 + (-2*b + 2*a)*x + (-2c + b) = 0

Now, this must be zero for all the values of x, then the parenthesis must be equal to zero:

-4 - 2*a = 0

-2*b + 2*a = 0

-2*c + b = 0

From the first equation:

-4 - 2*a = 0

-4 = 2*a

-4/2 = a

a = -2

And from the second equation:

-2*b + 2*a = 0

2*a = 2*b

a = b

b = -2.

From the third equation we have:

-2c + b = 0

-2c = b

c = b/-2 = -2/-2 = 1.

c = 1

Then our equation is:

y = -2*x^2 - 2*x + 1.

4 0
3 years ago
whats the lateral area of a right circular cone if the diameter of the base is 4m and the slant height of the cone is 15m? round
alex41 [277]
First is to understand the terms. Lateral area is the surface area of a 3D figure, excluding the area of any base. 
<span>Laterial Area (L.A.) of a right cone = pi*radius*slant height </span>
<span>radius = 1/2 * diameter </span>
<span>L.A. = pi*(1/2)*(4)*(15)=30*pi </span>

<span>the formula for this is pi*r*rt(r^2 + h^2). If the diameter is 4, then the radius is 2. If the slant height is 15, then to get the real height we use the Pythagorean Theorem and get rt(221). So the lateral area is pi*2*rt(2^2 + (rt221)^2)...= 2pi*rt(225) = 30pi = 94.248 meters squared which is rounded to 94 meters squared.</span>
8 0
4 years ago
What is the answer to this question a b c or d?
antiseptic1488 [7]

Answer:

B.

Step-by-step explanation:

Please mark as Brainliest! :)

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What is the coefficient in the expression x-27?
Ymorist [56]
X - 27

The coefficient is a number used to multiply a variable. The variable is x. The coefficient is : (understood but not written)...it is 1.
ur problem is actually 1x - 27.....however, the 1 is not usually written.
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What is the slope of a line that passes through (-12,15) and (0,4)
NISA [10]
The slope would be letter b
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