3 years ago

Is the product of two rational numbers always rational or always irrational or neither

Mathematics

1 answer:

Bad White [126]3 years ago

3 0

Answer:

$Always$ $rational$

Step-by-step explanation:

The product of two rational numbers is always rational.

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Need help! Law of cosines...find b round to the nearest tenth please

dusya [7]

ANSWER

$B = 27.8 \degree$

EXPLANATION

The law of cosine is given by the formula:

${b}^{2} = {a}^{2} + {c}^{2} - 2bc \cos(B)$

From the diagram,

a=17, b=8, c=16

We substitute the given values into the formula to obtain:

${8}^{2} = {17}^{2} + {16}^{2} - 2(17)(16)\cos(B)$

$64 = 289+ 256- 544\cos(B)$

$64 = 545- 544\cos(B)$

$64 - 545 = - 544\cos(B)$

$- 481 = - 544\cos(B)$

$\frac{ - 481}{ - 544} = \cos(B)$

$cos(B) = 0.88419$

$B = \cos ^{ - 1} (0.88419)$

$B = 27.8 \degree$

3 0

3 years ago

Read 2 more answers

Flora has saved $4 less than twice the amount Jason has saved. Together they have $44. How much has each person saved?

shusha [124]

Answer:

$20

Step-by-step explanation:

$44 - $4 = 40

40 divided by 2=$20

4 0

2 years ago