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3 years ago

-1+(-3) What is the answer? Show your work

Mathematics

2 answers:

postnew [5]3 years ago

8 0

Answer:

its -3

Step-by-step explanation: PEMDAS so you do -1 x -3= -3

uranmaximum [27]3 years ago

3 0

Answer:

-4

Step-by-step explanation:

-1+(-3)

golden rules in math

+*- = -

+*+=+

-*-=+

-*+=-

hence -1+(-3)= -1-3=- 4

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The equations given are in standard form. Put each equation in slope-intercept form. State the slope and the

rusak2 [61]

Answer:

3. $\displaystyle y = \frac{2}{5}x + 1\frac{2}{5}$

2. $\displaystyle y = -\frac{5}{7}x + 2$

1. $\displaystyle y = -2x + 4$

Step-by-step explanation:

3. 2x - 5y = −7

- 2x - 2x

__________

$\displaystyle \frac{-5y}{-5} = \frac{-2x - 7}{-5} \\ \\ y = \frac{2}{5}x + 1\frac{2}{5}$

2. 5x + 7y = 14

- 5x - 5x

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$\displaystyle \frac{7y}{7} = \frac{-5x + 14}{7} \\ \\ y = -\frac{5}{7}x + 2$

1. 6x + 3y = 12

- 6x - 6x

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$\displaystyle \frac{3y}{3} = \frac{-6x + 12}{3} \\ \\ y = -2x + 4$

I am joyous to assist you anytime.

8 0

3 years ago

What is the value of x?<br><br> PLZ HELP!!

Lelechka [254]

Answer:

x = 12

Step-by-step explanation:

Supplementary angles, sum = 180

10x - 20 + 6x + 8 = 180

16x - 12 = 180

16x = 192

x = 12

3 0

3 years ago

Read 2 more answers

A sample of tritium-3 decayed to 94.5% of its original amount after a year.

Zolol [24]

(a) If $y(t)$ is the mass after $t$ days and $y(0) = A$ then $y(t) = Ae^{kt}.$

$y(1) = Ae^k = 0.945A \implies e^k = 0.945 \implies k = \ln 0.945$

$\text{Then } Ae^{(\ln 0.945)t} = \frac{1}{2}A\ \Leftrightarrow\ \ln e^{(\ln 0.945)t} = \ln \frac{1}{2}\ \Leftrightarrow\ ( \ln 0.945) t = \ln \frac{1}{2} \Leftrightarrow \\ \\
t = - \frac{\ln 5}{\ln 0.945} \approx 12.25 \text{ years}$

(b)
$Ae^{(\ln 0.945) t} = 0.20 A \ \Leftrightarrow\ (\ln 0.945) t \ln \frac{1}{5}\ \implies \\ \\
t = - \frac{\ln 5}{\ln 0.945} \approx 28.45\text{ years}$