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3 years ago

A collection of dimes and nickels has a value of 1.65. if there are 20 coins in all how many of the coins are dimes?

Mathematics

1 answer:

Nostrana [21]3 years ago

3 0

This question gives you information to make a system of equations, which you then use substitution to solve.

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Find the slope of the lines joining each of the following pair of points. (1,7) and (4,2)

Damm [24]

Answer:

-5/3

Step-by-step explanation:

We can find the slope using the slope formula

m = ( y2-y1)/(x2-x1)

= ( 2-7)/(4-1)

-5/3

8 0

3 years ago

Determine the center and radius of the following circle equation: x^2+y^2+20x+8y+35=0

natta225 [31]

Answer:

center: (-10,-4)

radius: 9

Step-by-step explanation:

Let's start off by moving the 35 to the other side and grouping the x and y terms we have

(x²+20x)+(y²+8y)= -35

Next we take the term with the x coeficcent, divide it by 2, and square it

for the x we would do (20/2)²=100

and make sure we add that to the 35

(x²+20x+100)+(y²+8y+16)= -35+100+16

next factor everythign to get

(x+10)²+(y+4)²=81

therefore the center is (-10,-4)

and the radius is √81 or 9

4 0

3 years ago

Suppose that W1 is a random variable with mean μ and variance σ21 and W2 is a random variable with mean μ and variance σ2. From

vivado [14]

Answer:

Step-by-step explanation:

The concept of variance in random variable is applied in solving for the value of c for the estimator cW1 + (1 − c)W2 to be most efficient. Appropriate differentiation of the estimator with respect to c will give the value of c when the result is at minimum.

The detailed analysis and step by step approach is as shown in the attachment.

7 0

3 years ago

Am so confused is it A or D and this lesson is 7.8 plz answer and if u want you can explain why it is A or D .

kogti [31]

Subtract to get your answer.
So, 3 1/6- 1 4/6
Make improper fractions so easier to subtract
19/6-10/6=9/6= 1 3/6
So your answer is A.
(It couldn’t be D because that’s more than you even started with.)

6 0

3 years ago

Please help me use full explanation please hurry

Keith_Richards [23]

Step-by-step explanation:

As we can see the question given

f(x) is varying accordingly to the interval

f(x) = 2 if 2<x≤4

The value of function is 2 for the interval 2 to 4

and interval is open at x=2 and closed at x = 4

f(x) = x + 3 if 4<x<8

The value of function is x + 3 and it is open at x = 4 and x = 8

f(x) = 2x if x $\geq$ 8

The value of function is 2x for x greater than or equal to 8

The image is attached for more clearing of doubt

3 0

3 years ago