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Advocard [28]
3 years ago
7

In a science class, 40% of the students received a grade of A, 30% received a grade of B, and 20% received a grade of C on a pro

ject. The others fell short of a passing grade. a. If 12 students received an A, how many students were in the science class? b. How many students received a failing grade?
Mathematics
2 answers:
8090 [49]3 years ago
7 0

Answer:

30 students are in the science class and 3 students recieved a failing grade.

Setler [38]3 years ago
5 0

Answer:

30, 3

Step-by-step explanation:

a. Let's call the total students x. If 40% x = 12, 0.4x = 12, x = 12/0.4 = 30 students.

b. We know that 100 - 40 - 30 - 20 = 10% of all students failed. This is 10% * 30 = 0.1 * 30 = 3 students.

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6 0
3 years ago
4x – 3y=8<br> 2. 5x – 2y = -11
AlladinOne [14]

Answer:

x = -7

y =  - 12

Step-by-step explanation:

The given system is:

4x-3y=8

5x-2y=-11

We make x the subject in the top equation to get:

x =  \frac{3}{4}y + 2

Plug this expression for x in the bottom equation to get

5( \frac{3}{4}y + 2) - 2y=  - 11

We expand to obtain

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Multiply through by 4

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Group similar terms

15y - 8y =  - 44 - 40

7y =  - 84

y =  -  \frac{84}{7}  =-12

This means

x =  -12\times  \frac{3}{4}  + 2

x =  - 7

6 0
3 years ago
Find the 10th term of the sequence defined by the rule, f (n) = 4n - 3.
DiKsa [7]

Answer:

<h3>                f(10) = 37</h3>

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6 0
3 years ago
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