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Pachacha [2.7K]
3 years ago
13

Need help plsssssssss

Mathematics
1 answer:
kotykmax [81]3 years ago
6 0

Answer:

4. 8.0

5. 27.6

6. 35.5 degrees

Step-by-step explanation:

#4- Cos 48= x/12

0.669131= x/12

x=8.0

#5

Sin 78= 27/x

0.978=27/x

0.978x=27

x=27.6

#5

Tan X= 15/21

tan x= .714

inverse tan= 35.5 degrees

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What is the volume of this rectangular prism?
Natalija [7]

Answer:

3

Step-by-step explanation:

To find the volume of a rectangular prism, multiply its 3 dimensions: length x width x height. The volume is expressed in cubic units.

The given rectangular prism has sides that have values of 3/2 (Decimal: 1.5), 4, and 1/2 (Decimal: 0.5).

So using the formula:

L × W × H

We can calculate:

V=whl=4·1.5·0.5=3

6 0
2 years ago
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Write the following phrase as an algebraic expression. Use b for the unknown. A number split into 18 equal parts
alukav5142 [94]

Answer:

b/18

Step-by-step explanation:

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3 years ago
49x^2=-21x-2 quadratic functions
lara [203]

Answer: 49x^2=-21x-2 quadratic functions -1/7and -2/7    



Step-by-step explanation:

Quadratic function:

In elementary algebra, the quadratic formula is a formula that provides the solution to a quadratic equation. There are other ways of solving a quadratic equation instead of using the quadratic formula, such as factoring, completing the square, graphing and others.

Move terms to the left side

49x^{2}  =-21x-2

49x^{2}  -(-21x-2) =0

 Distribute

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Use the quadratic formula



 x=(-b±√b^{2}  -4ac  ) / 2a

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

Once in standard form, identify a, b, and c from the original equation and plug them into the quadratic formula.

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let, a=49

b=21

c=2

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X=(-b±√b^{2}  -4ac  ) / 2a

Simplify

Evaluate the exponent

Multiply the numbers

Subtract the numbers

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Separate the equations

To solve for the unknown variable, separate into two equations: one with a plus and the other with a minus.Separate

x=(-21+7) /98

x=(-21-7) /98

Solve

Rearrange and isolate the variable to find each solution

x=-1/7

x=-2/7



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