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AfilCa [17]
3 years ago
10

Why should you check the solution in both equations of a system?

Mathematics
1 answer:
hram777 [196]3 years ago
6 0

Answer:

Systems of equations are used to solve applications when there is more than one unknown and there is enough information to set up equations in those unknowns.

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out of some students appeared in an examination 80% passed in mathematics 75% passed in english and 5% failed in both subjects i
Advocard [28]

Answer:

5000 students appeared in the examination.

Step-by-step explanation:

We solve this question using Venn probabilities.

I am going to say that:

Event A: Passed in Mathematics

Event B: Passed in English.

5% failed in both subjects

This means that 100 - 5 = 95% pass in at least one, which means that P(A \cup B) = 0.95

80% passed in mathematics 75% passed in english

This means that P(A) = 0.8, P(B) = 0.75

Proportion who passed in both:

P(A \cap B) = P(A) + P(B) - P(A \cup B)

Considering the values we have for this problem

P(A \cap B) = P(A) + P(B) - P(A \cup B) = 0.8 + 0.75 - 0.95 = 0.6

3000 of them were passed both subjects how many students appeared in the examination?

3000 is 60% of the total t. So

0.6t = 3000

t = \frac{3000}{0.6}

t = 5000

5000 students appeared in the examination.

4 0
3 years ago
If arc CE is 125°, what is the measure of angle CDE?
Delvig [45]

Check the picture below.

7 0
2 years ago
1. Change the following subtraction problems into addition problems.
Molodets [167]

Answer:

a. -2 + (-3)

b. 8 + 1

c. 4 + (-9)

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3 years ago
Answer for brainliest
vesna_86 [32]
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and also it has to be 20 characters long so yeahhhh
5 0
3 years ago
Please help me on this math homework.Its trigonometry identities.
Karo-lina-s [1.5K]

Step-by-step explanation:

Both questions solved

i hope its very useful for u

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