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Alinara [238K]
3 years ago
9

15 points! please answer all questions

Mathematics
1 answer:
Anton [14]3 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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Sean, Ryan, and Justin shared a sum of money in the ratio 3 : 4 : 5. If Sean received $30, what was the sum of money shared?
Solnce55 [7]
In order to solve this problem, you need to find out how 3 of something  is 30
In this case, you multiply 10.
Sean= 3×10=30
Ryan= 4×10=40
Justin=  5×10= 50
30+40+50= 120
The answer is $120
Hope this helps
7 0
3 years ago
Look at image worth 20 pointd help!!
Alecsey [184]

Answer:

y=-\frac{9}{7}x-2

Step-by-step explanation:

Here, we have to convert the equation to slope-intercept form so we can find the perpendicular slope:

7x-9y=-5

-9y=-5-7x

y=-\frac{5}{9}+\frac{7}{9}x

y=\frac{7}{9}x-\frac{5}{9}

Since our slope is m=\frac{7}{9}, then that means the slope perpendicular to it is m=-\frac{9}{7}.

Now we find our new y-intercept so that the line will pass through the point (-7,7):

y=mx+b

y=-\frac{9}{7}+b

7=-\frac{9}{7}(-7)+b

7=9+b

-2=b

Therefore, the equation of the new line is y=-\frac{9}{7}x-2

7 0
3 years ago
Log5(10x-1)=log5(9x+7)<br> whats the final answer
Masja [62]

Answer:

x = 8

Step-by-step explanation:

log₅ (10x − 1) = log₅ (9x + 7)

10x − 1 = 9x + 7

x = 8

3 0
3 years ago
Use the information given to enter an equation in standard form.<br><br> (−1, 1) and (0, 2) .
AVprozaik [17]

First find the slope:

   m = ( 2 - 1 ) / ( 0 - (-1) ) = 1 / 1 = 1

Set up slope-intercept form:

  y = 1·x +2

Now move x and y to the left and leave 2 on the right:

  -x + y = 2

This is also equivalent to x - y = -2, so that just depends if you want your x coefficient to be positive or negative.

5 0
3 years ago
Read 2 more answers
Pls help :(
Masja [62]

Answer:

similarity

Step-by-step explanation:

look , dude

the two triangles have the following features:

the angle B= angle C = 90 degree

the angle A= the angle F

so  the third angle in the first triangle = the third angle in the second triangle

so you have one condition of similarity which is the three angles are equal

to get the answer for lengths :

ab/fe= constant of proportionality

thus ab/fe=2.5/5=.5

so ac/13=.5 thus ac=6.5

and 6/de=.5 so de=12

4 0
3 years ago
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