If the spool has 10 cm of circumference or perimeter, this means that 10 cm of thread fits the whole circumference of the spool, which also means that

<h2>1 unwind is equivalent to 10 cm of thread. </h2>

Then, we have to make the following question:

If 10 cm of thread is equivalent to 1 unwind, to how many unwinds is equivalent 80 cm of thread?

If we want to know how many time does Alex need to unwind the spool, we can use the following relation also called the <u>Rule of Three: </u>

$10 cm----1 unwind$

$80 cm----X unwinds$

$X=\frac{80cm(1unwind)}{10cm}$

$X=8unwinds$

The answer is:

Alex must unwind the spool 8 times in order to get $80$ cm of thread

5 0

3 years ago

Find the discriminant of 3x^2-10+-2

Dahasolnce [82]

Step-by-step explanation:

y = 3x² - 10x - 2

a = 3

b = -10

c = -2

D = b² - 4ac

D = (-10)² - 4.3.(-2)

D = 100 + 24

D = 124

3 0

2 years ago

2x + y = 3 2x – y = 4 Using elimination to solve this system results in the equation .

DanielleElmas [232]

You can use elimination by adding the two equations to "cancel out" one of the variables. in this example y will cancel out.

2x + y = 3
+
2x - y = 4
________
2x = 6
x = 3

now that we know our x value, we can plug it into one of the other equations to get our y value.

2(3) + y = 3
6 + y = 3
y = -3

your answer for this system is x=3, y=-3

8 0

2 years ago

Read 2 more answers

Maleah spins a spinner twice. What is the probability that she spins an odd number and then spins a 3?

vodka [1.7K]

Answer:

Step-by-step explanation:

0.5

4 0

2 years ago