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dolphi86 [110]
3 years ago
7

Find the value of 9u +4 given that 7u-4=3.

Mathematics
2 answers:
xenn [34]3 years ago
6 0

Answer:

13

Step-by-step explanation:

Given

7u - 4 = 3 ( add 4 to both sides )

7u = 7 ( divide both sides by 7 )

u = 1

Then

9u + 4 = 9(1) + 4 = 9 + 4 = 13

lesya [120]3 years ago
6 0

Answer:

7u - 4 = 3 \\ 7u = 4 + 3 \\ 7u = 7 \\ u =  \frac{7}{7}  \\  \boxed{u = 1} \\\\f(u) =  9u + 4 \\ f(1)  = 9(1) + 4 \\f(1)  = 9 + 4  \\ \boxed{f(1) = 13 }

  • <u>13</u> is the right answer.
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3 years ago
Use the exponential decay​ model, Upper A equals Upper A 0 e Superscript kt​, to solve the following. The​ half-life of a certai
Akimi4 [234]

Answer:

It will take 7 years ( approx )

Step-by-step explanation:

Given equation that shows the amount of the substance after t years,

A=A_0 e^{kt}

Where,

A_0 = Initial amount of the substance,

If the half life of the substance is 19 years,

Then if t = 19, amount of the substance = \frac{A_0}{2},

i.e.

\frac{A_0}{2}=A_0 e^{19k}

\frac{1}{2} = e^{19k}

0.5 = e^{19k}

Taking ln both sides,

\ln(0.5) = \ln(e^{19k})

\ln(0.5) = 19k

\implies k = \frac{\ln(0.5)}{19}\approx -0.03648

Now, if the substance to decay to 78​% of its original​ amount,

Then A=78\% \text{ of }A_0 =\frac{78A_0}{100}=0.78 A_0

0.78 A_0=A_0 e^{-0.03648t}

0.78 = e^{-0.03648t}

Again taking ln both sides,

\ln(0.78) = -0.03648t

-0.24846=-0.03648t

\implies t = \frac{0.24846}{0.03648}=6.81085\approx 7

Hence, approximately the substance would be 78% of its initial value after 7 years.

5 0
3 years ago
The railing of a wheelchair ramp is parallel to the ramp. Find x and y in the diagram.
yKpoI14uk [10]

Given:

The wheel chair ramp is parallel to the ramp.

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The value of x and y.

Solution:

If two lines are parallel, then the alternate interior angles are congruent.

4x° + 6y° = 86° --------- (1)

Similarly,

5x° + 6y° = 94°

Subtract 5x° from both sides.

5x° + 6y° - 5x° = 94° - 5x°

6y° = 94° - 5x° --------- (2)

Substitute (2) in (1).

4x° + 94° - 5x° = 86°

94° - x° = 86°

Subract 94° on both sides.

94° - x° - 94° = 86° - 94°

- x° = 86° - 94°

- x° = -8°

Multiply by -1 on both sides, we get

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Substitute x = 8 in (2).

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Divide by 6 on both sides, we get

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The value of x is 8 and y is 6.

5 0
3 years ago
What is the distance between the points (4, -8) and (10,8)?
LuckyWell [14K]

Answer:

you can not find the distance between them

Step-by-step explanation:

there are no like numbers, if the problem was 4, -8 and 4, 8 i could solve it, so sorry

3 0
3 years ago
Read 2 more answers
(4x-25) help quickly pls
Oduvanchick [21]

Answer: 4x-25 is the answer

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
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