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vaieri [72.5K]
2 years ago
9

How many inches of ribbon does Mary have if she has 6 yards of ribbon?(A)18 inches (B)72 inches (C) 216 inches (D)648 inches

Mathematics
1 answer:
Nastasia [14]2 years ago
8 0

Answer:

c. 216.

Step-by-step explanation:

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If a line includes the points (8,0) and (20,12). What is its equation in slope-intercept form?
aev [14]

The slope-intercept form:

y=mx+b

m - slope

b - y-intercept

The formula of a slope:

m=\dfrac{y_2-y_1}{x_2-x_1}

substitute the coordinates of the points (8, 0) and (20, 12) to the formula:

m=\dfrac{12-0}{20-8}=\dfrac{12}{12}=1

y = 1x + b = x + b

Put the coordinates of the point (8, 0) to the equation of a line:

0 = 8 + b      <em>subtract 8 from both sides</em>

-8 = b

<h3>Answer: y = x - 8</h3>
8 0
3 years ago
What is the slope of line that passes through the points -2,4 and 1,-1​
GalinKa [24]

Answer:

-5/3

Step-by-step explanation:

-2 to 1 =3   x=3

4 to -1=5   y=-5

y/x      slope=-5/3 or -1  2/3

4 0
3 years ago
Element X is a radioactive isotope such that its mass decreases by 59% every day. If an experiment starts out with 390 grams of
miss Akunina [59]

Answer:

The function that represents the mass of the sample after t days is A(t) = 390(0.41)^t.

The percentage rate of change per hour is of -2.46%.

Step-by-step explanation:

Exponential amount of decay:

The exponential amount of decay for an amount of a substance after t days is given by:

A(t) = A(0)(1-r)^t

In which A(0) is the initial amount, and r is the decay rate, as a decimal.

Element X is a radioactive isotope such that its mass decreases by 59% every day. The experiments starts out with 390 grams of Element X.

This means, respectively, that r = 0.59, A(0) = 390

So

A(t) = A(0)(1-r)^t

A(t) = 390(1-0.59)^t

A(t) = 390(0.41)^t

The function that represents the mass of the sample after t days is A(t) = 390(0.41)^t.

Hourly rate of change:

Decreases by 59% every day, which means that for 24 hours, the rate of change is of -59%. So

-59%/24 = -2.46%

The percentage rate of change per hour is of -2.46%.

5 0
3 years ago
Find the area of the kite with diagonals a= 12 and b=9
Gnoma [55]

maybe 108 is the answer.

4 0
2 years ago
Read 2 more answers
Please help, thank you
bogdanovich [222]

Answer:

B

Step-by-step explanation:

He asked me to make sure I had enough 20 words. But this question is really simple, Just move c to the right. And then change the symbol.

6 0
2 years ago
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