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3 years ago

True or False?? .............................

Mathematics

2 answers:

LekaFEV [45]3 years ago

8 0

Answer:

false

Step-by-step explanation:

alexandr402 [8]3 years ago

8 0

Answer:

That is true.

Step-by-step explanation:

Look at this example:

3/1 = 1/3 This example applies to most fractions.

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(Will l give 25 points!) Solve the system of linear equations by substitution. -8x + y = 5 and 5x - y = 3

Serggg [28]

Answer:

x = -8/3 and y = -49/3

Step-by-step explanation:

(Step 1) To solve using substitution, you first need to isolate a variable in one of these equations. I chose to isolate "y" in the following equation.

-8x + y = 5 <--- Original equation

y = 5 + 8x <--- Add 8x to both sides

(Step 2) Now, substitute (5 + 8x) for "y" in the second equation.

5x - y = 3 <--- Original equation

5x - (5 + 8x) = 3 <--- Substitute 5 + 8x for "y"

5x - 5 - 8x = 3 <--- Distribute (-) in the parentheses

-3x - 5 = 3 <--- Combine terms with "x"

-3x = 8 <--- Add 5 to both sides

x = -8/3 <--- Divide both sides by -3

(Step 3) Since you know the value of "x", plug it into one of the equations to solve for "y".

y = 5 + 8x <--- Original (rearranged) equation

y = 5 + 8(-8/3) <--- Plug (-8/3) for "x"

y = 5 - 64/3 <--- Multiply

y = 15/3 - 64/3 <--- Convert 5 into a fraction

y = -49/3 <--- Subtract

(Step 3.5) You can check your work by plugging "y" into the other equation to see if the answer for "x" is the same.

5x - y = 3 <--- Original equation

5(-8/3) - y = 3 <--- Plug (-8/3) for "x"

-40/3 - y = 3 <--- Multiply

-40/3 - y = 9/3 <--- Convert 3 into a fraction

-49/3 - y = 0 <--- Subtract both sides by 9/3

-49/3 = y <--- Add both sides by "y"

The value of the system of equations is x = -8/3 and y = -49/3.

6 0

2 years ago

2. Craig read 3 books each week for 3 weeks. Joe read 4 books a week for 3 weeks. How many more books did Joe read? Choose the a

Burka [1]

Answer:

4*3 - 3*3;

Joe read 3 more books than Craig

Step-by-step explanation:

Given

Craig:

3 books weekly for 3 weeks

Joe:

4 books weekly for 4 weeks

Required

How many more books did Joe read.

First, we need to determine number of books Craig reads

If in a week, Craig reads 3 books

Then in 3 weeks, Craig reads 3 * 3 books

Next, we need to determine number of books Joe reads

If in a week, Joe reads 3 books

Then in 4 weeks, Joe reads 4 * 3 books

Next, we determine the difference;

$Difference = 4 * 3 - 3 * 3$

$Difference = 12 - 9$

$Difference = 3$

Hence, Joe reads 3 more books

Option D answers the question.

3 0

3 years ago

What is the area of the composite <br><br>A. 70<br>B. 100<br>C. 105<br>D. 130

Sidana [21]

Answer: The answer is B

hehe

3 0

3 years ago

Given the calculations shown, find the dimensions of the prism.

ra1l [238]

The dimensions of the prism has height of 7 units, width of 10 units and length of 10 units.

<h3>What is an equation?</h3>

An equation is an expression that shows the relationship between two or more variables and numbers.

From the prism:

Perimeter P = 2(w + l)

40 = 2(w + l)

w + l = 20 (1)

Also:

Base area (B) = wl

100 = wl (2)

from equation 1 and 2:

w = 10, l = 10

The dimensions of the prism has height of 7 units, width of 10 units and length of 10 units.

Find out more on equation at: brainly.com/question/2972832

#SPJ1

3 0

2 years ago

What is the value of 30-2(7+2)-1?

nata0808 [166]

30 - 2(7 + 2) - 1

Distribute -2 into the parenthesis:

30 - 14 - 4 - 1

Subtract from left to right:

16 - 4 - 1

12 - 1

11

3 0

3 years ago

Read 2 more answers