What is 6(-7+6i)(-4+2i)?

A drug that it will decrease the bacteria cells by 5% every hour. If you start with 1500 bacteria cells, how many will be presen

scZoUnD [109]

after 8 hours there are 995 bacteria cells left

let y be the amount after 8 hours

the multiplying factor is 100 - 5 = 95 % = 0.95

y = 1500 × $(0.95)^{8}$ = 995

5 0

3 years ago

So I have 5 cats and eat 2819 how many do I have left

olga55 [171]

Answer:

-2814

Step-by-step explanation:

5 cats, u eat 2819 of them, that means u have negative 2819

7 0

3 years ago

Read 2 more answers

Find the product. Write your answer in exponential form. 5^7•5^-9•5^-5

MissTica

5^7 = 5 × 5 × 5 × 5 × 5 × 5 × 5 = 78,125

5^-9 = 5 ÷ 5 ÷ 5 ÷ 5 ÷ 5 ÷ 5 ÷ 5 ÷ 5 ÷ 5 = 0.000000512

5^-5 = 5 ÷ 5 ÷ 5 ÷ 5 ÷ 5 = 0.00032

78,125 × 0.000000512 × 0.00032 = 0.0000128‬

Answer: 0.0000128‬ or 1.28 x 10^-5

4 0

3 years ago

The perimeter of a particular square and the circumference of a particular circle are equal. What is the ratio of the area of th

Tasya [4]

Ratio of the area of the square to the area of the circle is $\frac{\pi}{4} : 1$

In terms of fraction $\frac{\pi}{4}$

Solution:

Given that perimeter of a particular square and the circumference of a particular circle are equal

To find: ratio of the area of the square to the area of the circle

Let the side of square be "a" and radius of circle be "r"

The perimeter of square is given as:

Perimeter of square = 4a

The circumference of circle is given as:

Circumference of circle = 2πr

From given,

perimeter of a particular square and the circumference of a particular circle are equal

perimeter of a particular square = circumference of a particular circle

$4a = 2 \pi r\\\\a = \frac{\pi r}{2}$

We need to find the ratio of the area of the square to the area of the circle.

We know that,

$\text{ Area of the square }= a^2\\\\\text{ Area of the circle }= \pi r^2$

Ratio of area of square to area of circle = $a^2 : \pi r^2$

Substituting the value of $a = \frac{\pi r}{2}$ in above ratio,

Ratio of area of square to area of circle = $(\frac{\pi r}{2})^2 : \pi r^2$

On reducing to lowest terms we get,

⇒ $\frac{\pi^2 r^2}{4} : \pi r^2 = \frac{\pi}{4} : 1$

In terms of fraction we get,

$\frac{\pi}{4} : 1 = \frac{\frac{\pi}{4}}{1} = \frac{\pi}{4}$

Thus ratio of the area of the square to the area of the circle is $\frac{\pi}{4} : 1$

3 0

4 years ago

Translate into an equation and solve. What is 28% of 39? is 28% of 39.

Mice21 [21]

Answer:

10.92

Step-by-step explanation:

turn the percent into a decimal, .28

.28×39=10.92

4 0

3 years ago