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elixir [45]
3 years ago
13

3. If x2 + 4 = 29, then x2 - 4 = ? A. 5 B. 121 C. 21 D. 25 E. 33

Mathematics
2 answers:
EastWind [94]3 years ago
7 0
Answer is c as x is 25/2
zvonat [6]3 years ago
6 0

Answer:

c

Step-by-step explanation:

<h3>because x²+4=29 you can solve the equation for x²</h3><h3>x²+4=29</h3><h3>x²=25</h3><h3>substitute the value of x² into the expression x²-4 to calculate the value the expression is equal to </h3><h3>x²-4=25-4=21</h3><h3>c.21 is your answer </h3><h3>hope this works</h3>
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stepan [7]

Answer:

Max's paper airplane flew \frac{77}{12} feet or 6\frac{5}{12} feet.

Step-by-step explanation:

As Nora's paper airplane flew 9 1/6 feet

i.e.

9\frac{1}{6}=\frac{55}{6}

Nora's paper was farther than Max's plane flew by = 2 3/4 feet

i.e.

2\frac{3}{4}=\frac{11}{4}

Thus the equation to show how far Max's paper airplane flew is:

\:\:9\frac{1}{6}-2\frac{3}{4}

=\frac{55}{6}-\frac{11}{4}

\mathrm{Least\:Common\:Multiplier\:of\:}6,\:4:\quad 12

\mathrm{Adjust\:Fractions\:based\:on\:the\:LCM}

=\frac{110}{12}-\frac{33}{12}

\mathrm{Since\:the\:denominators\:are\:equal,\:combine\:the\:fractions}:\quad \frac{a}{c}\pm \frac{b}{c}=\frac{a\pm \:b}{c}

=\frac{110-33}{12}

\mathrm{Subtract\:the\:numbers:}\:110-33=77

=\frac{77}{12}

=6\frac{5}{12}

Therefore, Max's paper airplane flew \frac{77}{12} feet or 6\frac{5}{12} feet.

6 0
3 years ago
The sum of the heights of two brothers is 10 feet, 4 inches. The difference between their heights is 10 inches. How tall is the
Leona [35]

Answer:

4.5 ft

Step-by-step explanation:

Let us assume the height of the taller brother be x

And, the height of the shorter brother be y

Now according to the question

x + y = 10.33

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Now solve these two equations

2x = 11.666

x = 5.833

y = 10.33 - 5.83

= 4.5 ft

7 0
3 years ago
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g100num [7]
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Answer:

all work is shown and pictured

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3 years ago
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antoniya [11.8K]
10 cents, cause the {ball +$1.00=$1.10} subtract $1 from both sides the ball=$0.10
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