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Pachacha [2.7K]
3 years ago
12

What is the value of b in this problem (-7)+b=(-8)

Mathematics
2 answers:
ss7ja [257]3 years ago
8 0

Answer:

-1

Step-by-step explanation:

-7+b=-8

Add 7 to -8 which would then get -1

seraphim [82]3 years ago
4 0

Good evening ,

______

Answer:

b = -1.

___________________

Step-by-step explanation:

(-7)+b=(-8) ⇔ 7+ (-7) + b = 7 + (-8) ⇔ b = 7 - 8 ⇔ b = -(8-7) ⇔ b = -(1)

:)

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Brian, Alex & Colin share some money in the ratio 1:9:3.
fiasKO [112]

Answer:

Step-by-step explanation:

1:9:3

brian gets x

alex gets 9x

colin gets 3x

Brian and colin receive 40

x + 3x = 40

x = 10

alex gets 9x = £90

3 0
2 years ago
I need help im stuck
Katyanochek1 [597]

Answer:

4712.4

Step-by-step explanation:

I got the same question a few days ago.

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6 0
3 years ago
The amount A of the radioactive element radium in a sample decays at a rate proportional to the amount of radium present. Given
slavikrds [6]

Answer:

a) \frac{dm}{dt} = -k\cdot m, b) m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }, c) m(t) = 10\cdot e^{-\frac{t}{2438.155} }, d) m(300) \approx 8.842\,g

Step-by-step explanation:

a) Let assume an initial mass m decaying at a constant rate k throughout time, the differential equation is:

\frac{dm}{dt} = -k\cdot m

b) The general solution is found after separating variables and integrating each sides:

m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }

Where \tau is the time constant and k = \frac{1}{\tau}

c) The time constant is:

\tau = \frac{1690\,yr}{\ln 2}

\tau = 2438.155\,yr

The particular solution of the differential equation is:

m(t) = 10\cdot e^{-\frac{t}{2438.155} }

d) The amount of radium after 300 years is:

m(300) \approx 8.842\,g

4 0
3 years ago
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√(A / 4π) = r                Switch the sides to make it easier to read
              r = √(A / 4π)
5 0
2 years ago
A board measures 25 1/4 foot long. Another board measures 33 1/3 foot long. How many inches longer is the board?
yaroslaw [1]

Answer:

97 inches

Step-by-step explanation:

4 0
3 years ago
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