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Alinara [238K]
2 years ago
9

15 points! please answer all questions

Mathematics
1 answer:
Anton [14]2 years ago
4 0
1. A.
x parrot fish + y triggerfish = 320 total fish. 
y = 7x shows that there are 7 times as many triggerfish.
2. C
x + y shows a total score of 425.
y = 2x - 70 shows that Michael's score, y, is 70 less (minus) than twice Kathryn's 
3. write two equations
x + y = 27 total feet
2x + 3 = y
Substitute 2x + 3 for y in the first equation
x + (2x + 3) = 27
3x + 3 = 27
3x = 24
x = 8
Substitute 8 in to either equation to find the other length.
8 + y = 27
y = 19
The shorter piece is 8 and the longer piece is 19
4. x + y = 3200 people -> y = 3200-x
8x + 12y = 33,040 dollars
8x + 12(3200 - x) = 33040
8x + 38400 - 12x = 33040
-4x = -5360
x = 1340 (1340 children)
1340 + y = 3200
y = 1860 adults
5. I don't think the numbers for this were put in correctly because I get a decimal and a negative number when I solve for it but hopefully if you do get the correct cost/amount of coins you will understand this well enough to do it on your own. Hope I helped!


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{ \tt{ |3x - 4|  > 6}} \\  \\ { \tt{3x > 6±4}} \\  \\ { \boxed{ \tt{ \: x = \frac{10}{3}   \:  \: or \:  \:  \frac{2}{3} }}}

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{ \tt{ |3x - 4|  >  - 4}} \\  \\ { \tt{3x >  - 4±4}} \\  \\ { \boxed{ \tt{ \: x > 0 \:  \: or \:  \:  -  \frac{8}{3} }}}

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