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netineya [11]
3 years ago
15

oy is training for a triathlon. She runs a distance of 2x miles, cycles a distance of (x2 + 7) miles, and swims a distance of (x

− 2) miles. Which simplified expression is equivalent to the total distance, in miles, Joy covers?
Mathematics
1 answer:
Evgesh-ka [11]3 years ago
7 0
Add
2x+x²+7+x-2
x²+3x+5 is the distance
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The altitude a ( in feet) of a plane t minutes after lift off is given by a=3400t+600
Julli [10]

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'a' in the formula represents altitude in feet. You are told the altitude is 21000 feet, so put that into the formula:

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  20400 = 3400t . . . . . subtract 600 from both sides

  6 = t . . . . . . . . . . . . . . . divide both sides by 3400

The problem statement tells you that t represents minutes after lift off, so this solution means the altitude is 21000 feet 6 minutes after lift off.

The question is asking for the number of minutes after lift off that the plane reaches an altitude of 21000 feet, so this answers the question directly:

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4 0
2 years ago
Work out m and c for the line:<br> y−4x=−1
Eduardwww [97]

Step-by-step explanation:

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7 0
3 years ago
A school choir has 80 students; 36 of them are in seventh grade. Also, 40 students in the choir are girls; 18 of them are in sev
Sati [7]
B. 29/40

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7 0
3 years ago
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<img src="https://tex.z-dn.net/?f=%20%5Cfrac%7B80%7D%7B100%7D%20%20%3D%20" id="TexFormula1" title=" \frac{80}{100} = " alt=" \f
alukav5142 [94]
Answer: 0.8 or 80% (either way is correct)

Explanations 80/100 equals 80 divided by 100 which equals 0.8 ; 0.8 equals 80%

(Hope this helps!)
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3 years ago
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