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4 years ago

K+3=-9 answers key please

Mathematics

2 answers:

True [87]4 years ago

8 0

12k because if you add the 3 and 9 and then put the letter beside it you will get your answer

vlabodo [156]4 years ago

7 0

K+3=-9
k=-12 is the answer

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What is the decibel level of the radio with intensity 10−7 watts per square inch? Use a logarithmic model to solve.

BaLLatris [955]

Answer:

$D = 50$

Step-by-step explanation:

Given

$I = 10^{-7}W/m^2$ --- Intensity

Required

Determine the decibel level (D)

This is calculated as:

$D = 10 * log(\frac{I}{I_n})$

Where:

$I_n =$ The threshold intensity

$I_n =1 * 10^{-12}W/m^2$

So, we have:

$D = 10 * log(\frac{I}{I_n})$

This gives:

$D = 10 * log(\frac{10^{-7}W/m^2}{1 * 10^{-12}W/m^2})$

$D = 10 * log(\frac{10^{-7}}{10^{-12}})$

Apply law of indices

$D = 10 * log(10^{-7--12})$

$D = 10 * log(10^{5})$

Apply law of logarithm

$loga^b = b\ log(a)$

So, we have:

$D = 10 * 5 * log(10)$

$log(10) =1$

So:

$D = 10 * 5 *1$

$D = 50$

Hence, the decibel level is 50

7 0

3 years ago

C. Assume someone has an average balance account with a bank that costs $35 a month but earns

Elodia [21]

Answer:

The total interest earned after subtracting the monthly $35

service fee = $975 - $35 = $940

Step-by-step explanation:

Bank fee cost per month = $35

Interest rate per month = 1%

The total amount in the account until the 15th = $100,000

The total amount in the account from the 15th to the 30th = $95,000

Interest Earned?

Interest earned for first 15 days:

= $100,000 times 1%/2

= $100,000 times 0.001/2

= $500

Interest earned from 15th to the 30th:

= $95,000 times 1%/2

= $95,000 times 0.001/2

= $475

Interest earned for first 15 days + Interest earned from 15th

to the 30th = $500 + $475 = $975

So, the total interest earned after subtracting the monthly $35

service fee = $975 - $35 = $940

Keywords: interest, interest rate

Learn more about interest calculation from brainly.com/question/3256069

#learnwithBrainly

8 0

3 years ago

Please help me on this geometry problem

marissa [1.9K]

Apparently, we are to presume the cost of the pizza is proportional to its area. The ratio of areas is proportional to the square of the ratio of diameters. Hence we expect a 20" pizza to cost
(20/12)² × $7.95 ≈ $22.08

3 0

3 years ago

I want to be a teacher some day and i know this question----------What is -15 -(-8)=? remember a negitive plus a negitive equals

irina [24]

Answer is -7 because -15+8=-7

8 0

3 years ago

write an equation for the line that passes through the point (8,3) and parallel to -4x+8y=23. Use slope-intercept form.

kvasek [131]

(1/2)x+b=y because the equation that given the slope is 1/2 if you leave y alone and take the x’s number

put the point now , 4+b=3 so b is -1

the equation is (1/2)x-1=y

6 0

3 years ago