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notsponge [240]

3 years ago

12

A collection of coins consists of dimes and nickels .The number of dimes is two more than the twice the number of nickels.The va

lue of the collection is $2.70. How many dimes are in the collection ?

1 answer:

CaHeK987 [17]3 years ago

7 0

27 dimes for my answer

hope it works

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Mr. and Mrs. Carlo want to buy a new car, but they do not have enough money in their bank account to pay the entire cost after t

sweet-ann [11.9K]

The answer is B. They get a loan and pay each month, because then they have time to get the money to pay it back while still getting the car.

6 0

3 years ago

X^2 + Y^2 +ax + 2y + 3 = 0<br><br> What number is this equation the equation of a circle?

Sav [38]

Answer:

Eq: (x+a/2)²+(y+1)²=(a²-8)/4

Center: O(-a/2, -1)

Radius: r=0.5×sqrt(a²-8)

Mandatory: a>2×sqrt(2)

Step-by-step explanation:

The circle with center in O(xo,yo) and radius r has the equation:

(x-xo)²+(y-yo)²=r²

We have:

x²+y²+ax+2y+3=0

But: x²+ax=x²+2(a/2)x+a²/4-a²/4= (x+a/2)²-a²/4

And

y²+2y+3=y²+2y+1+2=(y+1)²+2

Replacing, we get:

(x+a/2)²-a²/4+(y+1)²+2=0

(x+a/2)²+(y+1)²=a²/4-2=(a²-8)/4

By visual inspection we note that:

- center of circle: O(-a/2, -1)

- radius: r=sqrt((a²-8)/4)=0.5×sqrt(a²-8). This means a²>8 or a>2×sqrt(2)

6 0

3 years ago

it takes 1/2 of a gallon of paint 1/3 of the wall. How Many gallons of paint will it take to paint the entire wall. helppp me as

Sidana [21]

1/3 of the wall takes 1/2 gallon paint.

3(1/3 wall) takes 3(1/2 paint)

1 wall takes 3/2 paint

Answer: 1 $\frac{1}{2}$ gallons paint

7 0

3 years ago

If points C, D, and E are on a line and CD20 and CE32, what are the possible values of DE?

aniked [119]

Answer:

DE 12

Step-by-step explanation:

i dont know

3 0

2 years ago

If (x+1,10)=(4,2y) then find the value of x & y

lawyer [7]

Answer:

<h2><em><u>x</u></em><em><u> </u></em><em><u>=</u></em><em><u> </u></em><em><u>3</u></em><em><u> </u></em><em><u> </u></em><em><u>&</u></em><em><u> </u></em><em><u>y</u></em><em><u> </u></em><em><u>=</u></em><em><u> </u></em><em><u>5</u></em></h2>

Step-by-step explanation:

<h3><em><u>Given</u></em><em><u>, </u></em></h3>

(x+1, 10) = (4, 2y)

<u>First</u><u> </u><u>x</u><u> </u><u>coordinate</u><u>, </u>

x + 1 = 4

=> x = 4 - 1

=> <em>x = 3 (Ans) (i)</em>

<u>Second</u><u> </u><u>y</u><u> </u><u>coordinate</u><u>, </u>

10 = 2y

$= > y = \frac{10}{2}$

=> <em>y</em><em> </em><em>=</em><em> </em><em>5</em><em> </em><em>(</em><em>Ans</em><em>)</em><em> </em><em>(</em><em>ii</em><em>)</em>

3 0

3 years ago