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Murrr4er [49]
3 years ago
9

there are 30 students in a math class of the 30 students 30% have an a in math 40% have a b in math how many students have a c i

n math​
Mathematics
2 answers:
Lunna [17]3 years ago
6 0

Answer:

the answer is 9

Step-by-step explanation:

30 percent of 30 is 9

40 percent of 30 is 12

12+9 =21

30-21 =9

stepladder [879]3 years ago
3 0

the answer is 9

30 percent of 30 is 9

40 percent of 30 is 12

12+9 =21

30-21 =9

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The length of a rectangle is (x - 9) feet. Its width is x feet. Write an expression you could use to find the perimeter
steposvetlana [31]

Answer:

The expression for the perimeter of the rectangle is: P = 4x - 18

Step-by-step explanation:

Perimeter of a rectangle:

A rectangle has length l and width w. It's perimeter is given by:

P = 2(l + w)

In this question:

l = x - 9, w = x

So

P = 2(x - 9 + x) = 2(2x - 9) = 4x - 18

The expression for the perimeter of the rectangle is: P = 4x - 18

6 0
2 years ago
Fine the area of the following polygons:
Papessa [141]

Answer:

1 . 24

2. 21

Step-by-step explanation:

1.

b=6

h=4

A= b*h

=6*4

=24

2. b=6

h= 7

A= 1/2*b*h

= 1/2*6*7

=21

3 0
2 years ago
What are the dimensions of the following matrix [5 3]?
nexus9112 [7]
The answer is none of these
7 0
3 years ago
a metal worker has a metal alloy that is 20% copper, and another metal alloy that is 60% copper. How many kilograms (kg) of each
emmainna [20.7K]

Let X = the 29% alloy and Y = the 60% alloy.

They want a total of 80kg, so you have X +Y = 80

Rewrite that to get X = 80-Y


You also want 0.20X + 0.60Y = 0.52(80)

Replace X with 80-y:

0.20(80-y) + 0.60y = 0.52(80)

Simplify:

16 - 0.20y + 0.60y = 41.6

Combine like terms:

16 +0.40y = 41.6

Subtract 16 from each side:

0.40y = 25.6

Divide both sides by 0.40

y = 25.6 / 0.40

y = 64


Now you have Y replace y with 80 in X = 80-Y

X = 80 - 64

X = 16

They need 64 Kg of the 60% alloy and 16 Kg of the 20% alloy.


5 0
2 years ago
a woman is expecting triplets. what is the probability that there are 2 girls and 1 boy? what is the probability that all 3 babi
navik [9.2K]
Let the boy be B and the girl be G
there are six possible outcomes 
BGG, GBB, GBG, BGB, BBB, and GGG
therefore the probability of getting one boy and two girls is \frac{1}{6}
also the probability of getting 3 girls is \frac{1}{6}

8 0
3 years ago
Read 2 more answers
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