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1 year ago

Please helppppppppppppp

Mathematics

2 answers:

aleksley [76]1 year ago

8 0

Answer:

The circumference is 18.84 inches.

Step-by-step explanation:

To find the circumference of the circle we can use the formula:

$C=2\pi r$

Where C is circumference and r is radius.

Now that we have the formula, we can substitute the numbers:

$C=2(3.14*3)\\C=2(9.42)\\C=18.84$

sashaice [31]1 year ago

6 0

Answer:

≈18.84956

Step-by-step explanation:

2·π·3

2*3.14*3=18.84956

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Do these equations have infinite solutions 2x + 5y= 31 and 6x -y = 13

katovenus [111]

$2x = 31 - 5y \\ x = \frac{31}{2} - \frac{5}{2}y$

$6x = 13 + y \\ x = \frac{13}{6} + \frac{1}{6} y$

8 0

2 years ago

Can please someone help me out and explain it step by step. Thank you

Anit [1.1K]

Answer: $x=7, \ y=-2$

Step-by-step explanation:

Given

Equations are $3x-y=23$ and $2x+3y=8$

take $3x-y=23$

$y=3x-23$

Put the value of y in another equation

$\Rightarrow 2x+3(3x-23)=8\\\Rightarrow 2x+9x-69=8\\\Rightarrow 11x=77\\\Rightarrow x=7$

Put the value of x in y

$y=3(7)-23=21-23=-2$

Hence, $x=7, \ y=-2$

7 0

2 years ago

Element X is a radioactive isotope such that its mass decreases by 26% every day. If an experiment starts out with 810 grams of

ioda

Answer:

The hourly decay rate is of 1.25%, so the hourly rate of change is of -1.25%.

The function to represent the mass of the sample after t days is $A(t) = 810(0.74)^t$

Step-by-step explanation:

Exponential equation of decay:

The exponential equation for the amount of a substance 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.

Hourly rate of change:

Decreases 26% by day. A day has 24 hours. This means that $A(24) = (1-0.26)A(0) = 0.74A(0)$ ; We use this to find r.

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

$0.74A(0) = A(0)(1-r)^{24}$

$(1-r)^{24} = 0.74$

$\sqrt[24]{(1-r)^{24}} = \sqrt[24]{0.74}$

$1 - r = (0.74)^{\frac{1}{24}}$

$1 - r = 0.9875$

$r = 1 - 0.9875 = 0.0125$

The hourly decay rate is of 1.25%, so the hourly rate of change is of -1.25%.

Starts out with 810 grams of Element X

This means that $A(0) = 810$

Element X is a radioactive isotope such that its mass decreases by 26% every day.

This means that we use, for this equation, r = 0.26.

The equation is:

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

$A(t) = 810(1 - 0.26)^t$

$A(t) = 810(0.74)^t$

The function to represent the mass of the sample after t days is $A(t) = 810(0.74)^t$

5 0

2 years ago

4.5w = 5.1w - 30<br><br> Please help!!!

Lelu [443]

4.5w = 5.1w - 30

4.5w - 5.1w = -30

-0.6w =-30

Divide both sides by -0.6

-0.6w/-0.6 = -30/-0.6

<span>w = 50

</span>I hope this helps.

6 0

2 years ago

WILL MARK YOU BRAINLIEST

navik [9.2K]

107 in the verse of 180 the whole turn will evaluate to 73.

Step-by-step explanation:

5 0

1 year ago

Please helppppppppppppp​

Please helppppppppppppp