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german
2 years ago
12

Last year, 120 students were sick at school. This year, 20% fewer students are sick. How many students are sick this year?

Mathematics
1 answer:
VMariaS [17]2 years ago
3 0
First find how many students are sick the second year:
0.20 × 120 = 24
Then all you need to do is subtract:
120 - 24 = 96
So the number of students that got sick this year is:
96 students
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What is the unit rate if there are 258 purple polka-dot pencils in 3 purple polka-dot purses?
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3 years ago
2) 3x + 4y = 8<br> 2x+y=42<br> a) (30, -19)<br> b) (31, -20)<br> c) (32,-22)<br> What is the answer
kirza4 [7]

Answer:

C

Step-by-step explanation:

We can solve simultaneous equations using substitution method, elimination method or graphical method. But for this purpose, we will be using the elimination method.

3x+4y=8 Equation 1

2x+y=42 Equation 2

Multiply Equation 1 by 2 and equation 2 by 3, so as to get the same coefficient for x

2(3x+4y=8)= 6x+8y=16 Equation 3

3(2x+y=42)= 6x+3y=126 Equation 4

Subtract equation 4 from 3, to eliminate x

6x-6x=0

8y-3y= 5y

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We now have 5y=-110

Divide both sides by 5,

y= -110/5

= -22

Substituting for y in equation 2

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x= 64/2

= 32

(x, y)

(32, -22)

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3 years ago
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