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Stells [14]
2 years ago
5

What is the value of x?

Mathematics
1 answer:
frez [133]2 years ago
5 0

\left\{\begin{array}{ccc}x+2y=4&\text{multiply both sides by 5}\\4x-5y=42&\text{multiply both sides by 2}\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}5x+10y=20\\8x-10y=84\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad13x=104\qquad\text{divide both sides by 13}\\\\\boxed{x=8}\\\\Answer:\ \boxed{\boxed{x=8}}

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a high school track teams long jump record is 21 feet and 2 1/4 inches. this year Tims best long jump is 20 feet and 9 1/2 inche
Alex787 [66]

Answer:

4.75 inches.

Step-by-step explanation:

We must introduce the symbols for inches and feet.

Here we will use, x' = x feet and x" = x inches

A high school track teams long jump record is 21 feet and 2\dfrac{1}{4} inches i.e. 21'2.25" this year.

Now, Tim's best long jump is 20 feet and 9\dfrac{1}{2} inches i.e. 20'9.5".

So, the difference between the record jump and Tim's best jump is

(21'2.25" - 20'9.5")

= (21'2.25" - 21') + (21' - 20'9.5")

= 2.25" + 2.5" {Since, 1' = 12" i.e. 21' = 20' 12"}

= 4.75"

Therefore, Tim has to jump 4.75 inches farther to break the record. (Answer)

3 0
2 years ago
What is the greatest common factor of the terms in the excerpt 21 x -18 x + 28 x y
Mandarinka [93]
X(21-18+28y). axis the greatest common factor
3 0
3 years ago
Which is the best estimate of x based on rounding the constants and coefficients in the equation to the nearest integer 6.15 (x
artcher [175]
Your answer would be x = 12.41 

6.15 (x - 8.86) = 21.83
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6.15x - 54.49 = 21.83
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6.15x = 76.32
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7 0
3 years ago
A furniture store is having a weekend sale and is offering a 20% discount on patio chairs and tables. The sales tax on furniture
dalvyx [7]
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4 0
3 years ago
Read 2 more answers
Find area of rhombus . please./.
lilavasa [31]

Answer: 126

Step-by-step explanation:

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2 years ago
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