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2 years ago

What is the value of "h"?

Mathematics

2 answers:

Bess [88]2 years ago

5 0

Answer:

2+h-48=30

2-48+h=30

-46+h=30

h=30+46

∴h=76

kotegsom [21]2 years ago

4 0

Answer:

h = 76

Step-by-step explanation:

2 + h - 48 = 30

h + 2 - 48 = 30

h - 46 = 30

h - 46 + 46 = 30 + 46

h = 76

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A high school mathematics teacher can grade a set of exams in 7 hours working alone. If their student teacher helps them, it wi

Stels [109]

It takes 9 hrs 19.8 minutes for the student teacher to grade the exams if they worked alone

<u>Solution:</u>

Let the efficiency of the school teacher be “x” and the efficiency of the student teacher be “y”

Here the word efficiency means the rate of doing work

Let the total work to be completed be W

According to the question,

The time taken by the school teacher to complete the work is 7 hrs.

So we can write it in equation form

$W = x \times 7$ ---- eqn 1

where W is the total work and x is the efficiency

Similarly for student teacher and school teacher doing the work simultaneously, we can write the equation as

$W =(x +y ) \times 4$

Equating eqn 1 and 2

$x \times 7=(x+y) \times 4$

7x = 4x + 4y

3x = 4y

So in ratio x : y = 4 : 3

Now putting value of x = 4 in equation (1) we get total work to be 28

Now, <em>total time taken by the student teacher = total work ÷ efficiency of student teacher</em>

Hence, total time taken by the student teacher = 28 ÷ 3 = 9.33 hrs

= 9 hrs 19.8 minutes

Hence it takes 9 hrs 19.8 minutes for the student teacher to grade the exams if they worked alone

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2 years ago

Which of the following polygons has five lines of symmetry?

Ivan

Pentagons are and example.

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2 years ago

Robin rolled a die and then flipped a coin. What is the probability she rolled an even number and the coin landed on heads?

aleksandr82 [10.1K]

Answer:

1/4

Step-by-step explanation:

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(1,2,3,4,5,6) are the possible numbers. 2,4,6 are even

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Since they are independent events, we can multiply the probabilities together

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3 years ago

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VARVARA [1.3K]

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so (a,b) = (-9,-6) and r = 3

so the answer is B

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2 years ago

Read 2 more answers

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emmasim [6.3K]

Answer:

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You didn't tell us anything s o i guess 220 baseball cards

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