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Vesnalui [34]
3 years ago
5

Which choice shows 2*4*15 rewritten correctly using the commutative property

Mathematics
1 answer:
diamong [38]3 years ago
8 0

Answer:

2x15x4= 30x4 = 120

Step-by-step explanation:

In commutative property does not matter the order of the multiplication.

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A tank contains 300 liters of fluid in which 40 grams of salt is dissolved. Brine containing 1 gram of salt per liter is then pu
bonufazy [111]

Answer:

A(t) = 300 -260e^(-t/50)

Step-by-step explanation:

The rate of change of A(t) is ...

A'(t) = 6 -6/300·A(t)

Rewriting, we have ...

A'(t) +(1/50)A(t) = 6

This has solution ...

A(t) = p + qe^-(t/50)

We need to find the values of p and q. Using the differential equation, we ahve ...

A'(t) = -q/50e^-(t/50) = 6 - (p +qe^-(t/50))/50

0 = 6 -p/50

p = 300

From the initial condition, ...

A(0) = 300 +q = 40

q = -260

So, the complete solution is ...

A(t) = 300 -260e^(-t/50)

___

The salt in the tank increases in exponentially decaying fashion from 40 grams to 300 grams with a time constant of 50 minutes.

6 0
3 years ago
Read 2 more answers
Mr.evans is paid $9.20 per hour for the first 40 hours he works in a week. He is paid 1.5 times that rate for each hour after th
Harman [31]
40*9.2=360.8
10.7*2.25=24.075
360.8
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384.875. I disagree he actually made 384.875 dallors
8 0
3 years ago
Solve for x and y...............​
sladkih [1.3K]

Answer:

9. x=30, y=10\sqrt{3}

11. x=5\sqrt{3}, y=10\sqrt{3}

Step-by-step explanation:

9)

\sin x=\dfrac{10}{20}\\x=\sin^{-1}\left( \dfrac{1}{2} \right)=30^{\circ}\\y=\sqrt{20^2-10^2}=\sqrt{400-100}=\sqrt{300}=10\sqrt{3}

11)

\tan 60= \dfrac{15}{x}\\x=\dfrac{15}{\tan 60}=5\sqrt{3}\\y=\sqrt{(5\sqrt{3})^2+15^2}=\sqrt{75+225}=\sqrt{300}=10\sqrt{3}

Hope this helps!

7 0
3 years ago
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Find the difference of (2x+5)(2x-5)
san4es73 [151]

Answer:

4x2−25

Step-by-step explanation:

(2x+5)(2x−5)

=(2x+5)(2x+−5)

=(2x)(2x)+(2x)(−5)+(5)(2x)+(5)(−5)

=4x2−10x+10x−25

4x2−25

3 0
3 years ago
HI! PLEASE HELP!! I just need the postulate or theorem, i know how to do the problem! (:
Juli2301 [7.4K]
Corresponding Angles Theorem
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