I can help you with no.1 it is 40
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Answer:
see below
Step-by-step explanation:
The graph of y=10 is the graph of all the points (x, 10) for any value of x. Each one of those points is 10 units above the x-axis. Together, those points make a horizontal line where y = 10 (!).
R=-7, you have to put each answer in the equation, therefore; 21=42-3(-7) So you have to do multiplication (PEMDAS, if you arent aware of that acronym then it stands for the order of what to do with an equation, Parentheses get solved first, then Exponents, then multiplication, then division, then addition, then finally subtraction. Solving in that order will solve your answer correctly.) With -3 times -7 which gives you 21. Then you do 42 - 21 which equals 21. So 21 = 21.
<em>The length of the square that has the same perimeter as the rectangle is of length 6cm and area of 48cm² is 7cm</em>
<h2>
Explanation:</h2>
Let's call:

From the question, we know that:
- <em>A rectangle and a square have the same perimeter.</em>
So:

Moreover:
- <em>The rectangle is of length 6cm and has an area of 48cm²</em>
Accordingly:

Also:

From the statement of perimeters:

Finally, <em>the length of the square that has the same perimeter as the rectangle is of length 6cm and area of 48cm² is 7cm</em>
<h2>Learn more:</h2>
Perimeter: brainly.com/question/9969486
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