9) Craig earns the same amount

Mathematics

1 answer:

Sloan [31]3 years ago

6 0

Answer:

Craig earns $1,200 each month

Explanation:

We are given that Craig pays a total of $720 each year for his telephone service

We also know that a year has 12 months

This means that:

Craig pays $\frac{720}{12}= 60$ dollars each month for his telephone services

We are given that the monthly phone bill is $\frac{1}{20}$ of his monthly earnings

Assume that his monthly payment is x

We have:

$\frac{1}{20}x = PhoneBill\\ \\ \frac{1}{20}x = 60\\ \\ x=60*20 = 1200$ dollars

Hope this helps :)

You might be interested in

Rationalize the denominator of square root of negative 9 over open parentheses 4 minus 7 i close parentheses minus open parenthe

AlekseyPX

The answer is
$\frac{-6i-3}{5}$ .

Before we rationalize the denominator, we must simplify the numerator and denominator. We evaluate the square root on the top, and combine like terms on the bottom:
$\frac{\sqrt{-9}}{(4-7i)-(6-6i)}
\\
\\=\frac{\sqrt{9i^2}}{4-6-7i--6i}
\\
\\=\frac{3i}{-2-i}$

To rationalize the denominator, we multiply by the conjugate. The conjugate is found by making the imaginary term of the complex number, the i part, the opposite sign. The conjugate of -2-i is -2+i:

$\frac{3i}{-2-i}\times \frac{-2+i}{-2+i}
\\
\\=\frac{3i(-2+i)}{(-2-i)(-2+i)}
\\
\\=\frac{3i\times -2 + 3i\times i}{-2\times -2 + -2\times i + -2\times -i + -i\times i}
\\
\\=\frac{-6i+3i^2}{4-2i+2i-i^2}
\\
\\=\frac{-6i+3(-1)}{4-i^2}=\frac{-6i-3}{4-(-1)}=\frac{-6i-3}{5}$

7 0

3 years ago

HELP EMERGENCY!!!! (2.5 x 10-10) (7 x 10-5) Express your answer in scientific notation.

dangina [55]

Answer:

$1.75$ × $10^{-15}$