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Naily [24]
3 years ago
10

Elsa got a prepaid debit card with $15 on it. For her first purchase with the card, she bought some bulk ribbon at a craft store

. The price of the ribbon was 7 cents per yard. If after that purchase there was $12.83 left on the card, how many yards of ribbon did Elsa buy?
Mathematics
1 answer:
Alex3 years ago
4 0

Answer:

31 yards

Step-by-step explanation:

If she has $12.83 left, that means she spent $2.17 out of the $15

15 - 12.83 = 2.17

One cent is .01 of a dollar

So that would be $0.07 per yard

To find the number of yards, we need to divide the total amount she spent by the price per yard.

2.17 ÷ 0.07 = 31

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The edges of the diameter of a circle are at (-1,2) and (3,-1). Write the equation of the circle in general form.
Y_Kistochka [10]

Answer:

(x-1)²+ (y-0.5)²=6.25

Step-by-step explanation:

<u>The standard form of equation of a circle is;</u>

(x-a)²+(y-b)²=r² where (a,b) are the center of the circle and r is the radius

<u>Finding the mid-point of the given points</u>

(-1,2) and (3,-1)⇒midpoint will be 1/2(x₁+x₂) , 1/2(y₁+y₂)

midpoint= {1/2(-1+3), 1/2(2+-1)}

midpoint=(1,0.5)

<u>Finding the radius r; the distance from the center to either of the given two points</u>

Apply the distance formula d=√ (x₂-x₁)² +(y₂-y₁)²

Taking (x₁,y₁) as (1,0.5) and (x₂,y₂) as (-1,2) then

d=√ (-1-1)² +(2-0.5)²

d= √ (-2)²+(1.5)²

d=√4+2.25⇒√6.25⇒2.5

r=2.5

<u>Equation of the circle</u>

(x-1)² + (y-0.5)²=2.5²

(x-1)²+ (y-0.5)²=6.25

3 0
3 years ago
Solve for x: 2x + 8 = 4x - 10
IgorLugansk [536]

Answer:

18=2x

x=9

Step-by-step explanation:

hope it helps bro

6 0
3 years ago
Read 2 more answers
Find the area of a regular hexagon with side length of 10 and apothem of 8.7 meters <br>HELP PLZZZ​
muminat

Answer:

43.5 meters

Step-by-step explanation:

Area of regular hexagon =

\frac{1}{2}  \times ap

in the problem you have a = 10 meters

and p = apothem = 8.7 meters

so if you apply the formula

you will have

area =( 1/2) × 10 × 8.7

area = 43.5 meters

8 0
3 years ago
I rly need help with #2-4 and #8-9 PLZZ
castortr0y [4]

Answer:

2. sin=12\15 cos=9/15 tg=12/9

3. sin=3/v13 cos=2/v13 tg=3/2

4. sin=v15/4 cos=7/4 tg=v15/7

7 0
3 years ago
Write the equation of the line that is parallel to the line 7 − 4 x = 7 y 7−4x=7y through the point (2,0).
lisov135 [29]
7 - 4x = 7y
1 - 4/7x = y....y = -4/7x + 1...slope here is -4/7. 
A parallel line will have the same slope

y = mx + b
slope(m) = -4/7
(2,0)...x = 2 and y = 0
now sub and find b, the y int
0 = -4/7(2) + b
0 = -8/7 + b
8/7 = b

so ur parallel equation is : y = -4/7x + 8/7 <=
4 0
3 years ago
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