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MArishka [77]
4 years ago
12

Solve the following system of equations using the substitution method.

Mathematics
2 answers:
Elina [12.6K]4 years ago
7 0
I think the answer is D !!
Vitek1552 [10]4 years ago
5 0

Answer:

D

Step-by-step explanation:

Since we already know what -y is we can use that to find y.

y = -5x -21.

Let's substitute that in the bottom equation

-4x -5x - 21 = 6.

Simplify.

-9x = 27.

x = -3

Let's solve using

y = -5x -21.

to find y.

y = -5(-3) - 21

y = 15 - 21

y = -6.

There you have it!

x = -3, y = -6

So.. The correct answer choice is D

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Solve for b pythagorean theorem! someone plz help meeeee
LUCKY_DIMON [66]

Answer:

3

Step-by-step explanation:

Since we already know c, so we need to find b.

c² = a² + b²

5² = 4² + b²

b² = 5² - 4²

b² = 25 - 16

b² = 9

b = 3

8 0
3 years ago
The count in a bacteria culture was 800 after 15 minutes and 1200 after 40 minutes. Assuming the count grows exponentially,
Maslowich

Answer:1) bacteria size = b(initial) * e^(r * t)  

initial size = 300  

final size = 1600.

 

Substituting the values into the main equation:

1600 = 300 * e^(r * 35 - 20)  

solving for 'r'.

1600 = 300 * e^(r * 15)  

1600/300 = e^(r * 15)  

taking natural log on both sides to eliminate the power

ln(16/3) = ln[e^(r * 15)]  

ln(16/3) = r * 15  

r  = ln(16/3) / 15

  = 0.11159843

  = 11.16%  

To find the initial bacteria size,  

Given: t = 20  

300 = b * e^(0.1116 * 20)  

Solving for b:

300 = b * e^2.232  

b = 300/e^2.232  

b = 32

Step-by-step explanation:

3 0
3 years ago
The original quantity is 10 and the new quantity is 13. What is the percent change?​
Leya [2.2K]

3 is 13 more than 10, and 3 is 30% of 10, so 30% im pretty sure

6 0
3 years ago
Read 2 more answers
A number pattern starts with 10 and follows the rule multiply by 3 What is true
lesya692 [45]

Answer:

B) They have a 0 in the ones place.

Step-by-step explanation:

Given

Number pattern that starts with 10.

Rule: Multiply by 3

Required

Select which statement is truth of the pattern.

First, the pattern needs to be listed out.

Given that the pattern starts from 10 and progresses by multiplying current term by 3.

The pattern is as follows;

10, 30, 90, 270, 810, 2430, 7290, .....

By comparing the given options with the above pattern of numbers. We have:

A) They are odd numbers.

This statement is false because the above pattern of numbers are all even and can never be odd

B) They have a 0 in the ones place.

This statement is truth because all the numbers in the above progression ends in 0. This 0 represents the unit of one's place.

Hence, this statement is truth.

C) They have a 3 in the tens place.

This statement is false;

This is so because they have different digits at tens place. The tens place is the digit prior to the last digit of each number.

D) They can be odd or ever numbers.

As pointed out in (A) above, the number can only be even number because the progression starts with an even number (10) and irrespective of what it's been multiplied by, it'll always remain an even number.

Hence,

Only option B is correct/truth.

Others are incorrect

3 0
4 years ago
Answer this please :D but bot kokes serious answers
kupik [55]
1 1/5 = 1.2
1.5-1.2 = 0.3
8 0
3 years ago
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