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2 years ago

6

Lurinda ordered some boxes of greeting cards online. The cost of the cards is $6.50n plus $3 where n is the number of boxes and

$3 is the shipping and handling charge. How much will Lurinda pay if she orders 8 boxes of cards?

2 answers:

Anarel [89]2 years ago

4 0

Multiply 6.60 with 8 then add 3

Nata [24]2 years ago

3 0

Multiply 6.60 bye 8 then add 3

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-3+3x=-2(x+1)<br> the 2 is a negative<br> please break it down

Veronika [31]

-3+3x=-2(x+1) First: I will get rid of the bracket:

-3+3x=-2x-2

Now, all the x goes to the left side, all the numbers without x to the right side:

3x+2x=-2+3

we add up"

5x=1

divide by 5:

$x= \frac{1}{5}$

7 0

3 years ago

Read 2 more answers

Dinosaur fossils are often dated by using an element other than carbon, like potassium-40, that has a longer half life (in this

Firlakuza [10]

The amount of substance left of a radioactive element of half life, $t_{\frac{1}{2}}$ after a time, t, is given by:

$N(t)=N_0\left( \frac{1}{2} \right)^ \frac{t}{t_{ \frac{1}{2} }}$

Given that <span>potassium-40 has a half life of approximately 1.25 billion years.

The number of years it will take for 0.1% of potassium-40 to remain is obtained as follows:

$0.1=100\left( \frac{1}{2} \right)^ \frac{t}{1.25}} \\ \\ \Rightarrow\left( \frac{1}{2} \right)^ \frac{t}{1.25}}=0.001 \\ \\ \Rightarrow\frac{t}{1.25}\ln\left( \frac{1}{2} \right)=\ln(0.001) \\ \\ \Rightarrow \frac{t}{1.25}= \frac{\ln(0.001)}{\ln\left( \frac{1}{2} \right)} =9.966 \\ \\ t=9.966(1.25)=12.5$

Therefore, </span><span>the maximum age of a fossil that we could date using 40k is 12.5 billion years.</span>

3 0

3 years ago

The integer having absolute value 10 are_________?

Bess [88]

The answer is 10 and -10

5 0

2 years ago

State when the following equation will be true and when it will be false. <br><br>14= 5 + k

dimulka [17.4K]

Answer:

K= 9 when it is true any other number would be false

Step-by-step explanation:

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2 years ago

Which choices are equivalent to the exponential expression below? Check all

vova2212 [387]

Answer is b hope this helps

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2 years ago