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Marina86 [1]
3 years ago
5

Find the value of 7u+2 given that -2u+8=6

Mathematics
1 answer:
Natasha2012 [34]3 years ago
3 0

Answer:

The value of 7u + 2 is 9.

Step-by-step explanation:

To solve this problem, we first must find the value of u given the second equation.  The first step in simplifying this equation is to subtract 8 from both sides of the equation.  This is modeled below:

-2u + 8 = 6

-2u + 8 - 8 = 6 -8

-2u = -2

Next, we can divide both sides by -2 to get the variable u alone on the left side of the equation.

-2u/-2 = -2/-2

u = 1

Therefore, the correct answer is u = 1. Now, we can plug in this value for u into the expression that is given.

7u + 2

= 7(1) + 2

= 9

Thus, the correct answer is 9.

Hope this helps!

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irina [24]

There are 651.335 million cells in the petri dish after 11 hours and the cells will reach 1 billion cells after 14.068 hours

<h3>How to determine the number of cells after 11 hours?</h3>

The given parameters are:

At t = 0, Bacteria = 140 million

At t = 6, Bacteria = 320 million

This can be represented as:

f(0) = 140

f(6) = 320

An exponential function is represented as:

f(t) = f(0) * r^t

When t = 6, we have:

320 = 140 * r^6

Divide both sides by 140

r^6 = 2.28571428571

Take the 6th root of both sides

r = 1.15

So, we have:

f(t) = f(0) * 1.15^t

Substitute f(0) = 140

f(t) = 140 * 1.15^t

After 11 hours, we have:

f(11) = 140 * 1.15^11

Evaluate

f(11) = 651.33

Hence, there are 651.335 million cells in the petri dish after 11 hours

Time to reach 1 billion cells

This means that

f(t) = 1 billion i.e. 1000 million

So, we have:

1000 = 140 * 1.15^t

Divide by 140

1.15^t = 7.14285714286

Take the logarithm of both sides

t * log(1.15) = log(7.14285714286)

Divide both sides by log(1.15)

t = 14.068

Hence, the cells will reach 1 billion cells after 14.068 hours

Read more about exponential functions at:

brainly.com/question/2456547

#SPJ1

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2 years ago
Anyone wann4 start a convo rn?
Marina86 [1]

sure why not i have nothing better to do

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