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3 years ago

Evaluate x(–y + z) for x = 3, y = 3, and z = 1.

Mathematics

2 answers:

Nookie1986 [14]3 years ago

8 0

Answer:

3(-3+1)=

3(-2)=

-6

Answer is - 6

Kazeer [188]3 years ago

7 0

The answer is -8. 3 x -3 = -9 + 1 = -8

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Mitch bought five books for $68.75. four of the books were sports books and cost the same price. the other book was a novel and

mart [117]

68.75 + 7= 75.75 your answer is $75.75

5 0

2 years ago

Which statement matches the inequality − 2 < 9?

swat32

Answer: Answer is C.

Step-by-step explanation: It is because positive numbers go to the right, and negative numbers to the left.

Hope that helps :)

8 0

2 years ago

Read 2 more answers

We take a milk carton from the refrigerator and put it on the table at room temperature. We assume that the temperature of the c

Kisachek [45]

We can solve this problem using separation of variables.

Then apply the initial conditions

EXPLANATION

We were given the first order differential equation

$\frac{dT}{dt}=k(T-a)$

We now separate the time and the temperature variables as follows,

$\frac{dT}{T-a}=kdt$

Integrating both sides of the differential equation, we obtain;

$ln(T-a)=kt +c$

This natural logarithmic equation can be rewritten as;

$T-a=e^{kt +c}$

Applying the laws of exponents, we obtain,

$T-a=e^{kt}\times e^{c}$

$T-a=e^{c}e^{kt}$

We were given the initial conditions,

$T(0)=4$

Let us apply this condition to obtain;

$4-20=e^{c}e^{k(0)}$

$-16=e^{c}$

Now our equation, becomes

$T-a=-16e^{kt}$

or

$T=a-16e^{kt}$

When we substitute a=20,
we obtain,

$T=20-16e^{kt}$

b) We were also given that,

$T(5)=8$

Let us apply this condition again to find k.

$8=20-16e^{5k}$

This implied

$-12=-16e^{5k}$

$\frac{-12}{-16}=e^{5k}$

$\frac{3}{4}=e^{5k}$

We take logarithm to base e of both sides,

$ln(\frac{3}{4})=5k$

This implies that,

$\frac{ln(\frac{3}{4})}{5}=k$

$k=-0.2877$

After 15 minutes, the temperature will be,

$T=20-16e^{-0.2877\times 15}$

$T=20-0.21376$

$T=19.786$

After 15 minutes, the temperature is approximately 20°C

6 0

3 years ago

Can someone help me please!.

garik1379 [7]

Answer:

f I used to know this one

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3 years ago

What is the volume & surface?

iogann1982 [59]

Answer:

180

Step-by-step explanation:

I multiplied both sides

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2 years ago