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kherson [118]
3 years ago
15

Can someone help me? Plzzzzz :c I need it for tmw

Mathematics
2 answers:
lys-0071 [83]3 years ago
5 0
x-cost\ of\ DVD\\y-cost\ of\ video\ game\\\\ \left \{ {{3x+14y=203\ \ \ } \atop {11x+11y=220\ \ } \right. \\\\ From\ first\ second:\\11x=220-11y\ \ \ \ |:11\\x=20-y\\\\Substitute\ to\ first:\\3(20-y)+14y=203\\60-3y+14y=203\\-3y+14y=203-60\\11y=143\ \ \ \ |:11\\y=13\\\\x=20-13=7\\\\ \left \{ {{y=13} \atop {x=7}} \right.
Sati [7]3 years ago
3 0
3D+14G=203(11)    use elimination      33D+154G=2233
11D+11G=220(-14)   to cancel G   -154D-154G=-3080
                                      
                                     -121D=-847   divide by -121 on both sides
                                         D=7     plug back into equation
11(7)+11G=220
77+11G=220   subtract 77 from both sides
11G=143 divide by 11 on both sides
G=13
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Could someone help me with this problem
wariber [46]

If inserted into a calculator, it should give you around \frac{1}{4096} = 2.4414*10^{-4}

3 0
4 years ago
Let f be a differentiable function such that f(1)=π and f'(x)=√x^3+6. what is the value of f(5)?
natali 33 [55]

The value of f(5) is 49.1

Step-by-step explanation:

To find f(x) from f'(x) use the integration

f(x) = ∫ f'(x)

1. Find The integration of f'(x) with the constant term

2. Substitute x by 1 and f(x) by π to find the constant term

3. Write the differential function f(x) and substitute x by 5 to find f(5)

∵ f'(x) = \sqrt{x^{3}} + 6

- Change the root to fraction power

∵ \sqrt{x^{3}} = x^{\frac{3}{2}}

∴ f'(x) = x^{\frac{3}{2}} + 6

∴ f(x) = ∫ x^{\frac{3}{2}} + 6

- In integration add the power by 1 and divide the coefficient by the

 new power and insert x with the constant term

∴ f(x) = \frac{x^{\frac{5}{2}}}{\frac{5}{2}} + 6x + c

- c is the constant of integration

∵ \frac{x^{\frac{5}{2}}}{\frac{5}{2}}=\frac{2}{5}x^{\frac{5}{2}}

∴ f(x) = \frac{2}{5} x^{\frac{5}{2}} + 6x + c

- To find c substitute x by 1 and f(x) by π

∴ π = \frac{2}{5} (1)^{\frac{5}{2}} + 6(1) + c

∴ π = \frac{2}{5} + 6 + c

∴ π = 6.4 + c

- Subtract 6.4 from both sides

∴ c = - 3.2584

∴ f(x) = \frac{2}{5} x^{\frac{5}{2}} + 6x - 3.2584

To find f(5) Substitute x by 5

∵ x = 5

∴ f(5) = \frac{2}{5} (5)^{\frac{5}{2}} + 6(5) - 3.2584

∴ f(5) = 49.1

The value of f(5) is 49.1

Learn more:

You can learn more about differentiation in brainly.com/question/4279146

#LearnwithBrainly

4 0
3 years ago
Help please
seropon [69]
The sum of the interior angles is 360
5 0
3 years ago
Read 2 more answers
76 is 95% of what number and my second question is what percent of 17 is 20.4
Oksi-84 [34.3K]
Firstly. make your unknown number X.

95% can be represented as 95/100 or 0.95

so 95% of X is 76...

0.95 × X = 0.76
           X = 0.76 ÷ 0.95 
           X = 0.8

_______________________________________________

for the second question.

(17 ÷ 20.4) and times it by 100 to get a percentage. 



7 0
3 years ago
What is the area of △STU rounded to the nearest tenth?
valentinak56 [21]

Answer:

38.7 units²

Step-by-step explanation:

4.6/SV = SV/8.1

SV² = 37.26

SV = 6.1

area = 1/2(8.1)(6.1) + 1/2(4.6)(6.1) = 38.7 units²

4 0
3 years ago
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