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inna [77]
3 years ago
15

18 questions answered correctly on a test. that is 75% of the total number of questions. How many questions were on the test?

Mathematics
1 answer:
adelina 88 [10]3 years ago
7 0

Answer:

24 = questions on test

Step-by-step explanation:

Questions answered correctly = questions on test * percent answered correctly


We know that she answered 18 correctly and that 75% were answered correctly

Substitute this information into the equation

18 = questions on test *.75

Divide by .75 on each side

18/.75 = questions on test *.75/.75

24 = questions on test

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The value of w varies directly with z. If z = 4, then w = 12. What is the value
IrinaVladis [17]

Answer:

18

Step-by-step explanation:

w varies directly with z, let k be the constant of proportionality, hence this can be represented by the equation:

w = kz

When z = 4, w = 12, hence we need to find the value of the constant of proportionality, substituting:

12 = 4k

Dividing both sides by 4:

12/4 = 4k/4

k = 3

Therefore the equation becomes:

w = 3z

The value of w when z = 6 is given as:

w = 3(6)

w = 18

7 0
3 years ago
Which of the following represents the sum of (3x^2 - 3x + 8) and ( -5x^2 + 4x + 2)
Umnica [9.8K]

Answer: -2x^{2}+x+10

Step-by-step explanation:

4 0
2 years ago
HELP PLZZ
valentina_108 [34]
Y = 11.5x + 22
y = -13x + 218

when will their balance be the same.....ur basically just subbing in 1 y for the other and u get :
11.5x + 22 = -13x + 218....now we solve for x
11.5x + 13x = 218 - 22
24.5x = 196
x = 196 / 24.5
x = 8 <== they will be the same at 8 weeks

11.5(8) + 22 = 114
-13(8) + 218 = 114
and they will both have $ 114 at 8 weeks <===
3 0
3 years ago
Read 2 more answers
Pls need help will give brainliest
Umnica [9.8K]

calculation with distribuation would be multipling each fraction by 6 first then add them together

1/2 becomes 3  2/3 becomes 4  3/4 becomes 9/2 now add them together 23/2 or 11 1/2      Now without distribuation you woud add everything togther then mutiply by 6    adding together would give you 23/12 then multiplying by 6 gives you 23/2

6 0
3 years ago
Entre Celia y Quique suman 14€. Si Celia tuviera 1 €, tendría el doble de dinero que Quique.¿ Cuanto dinero tiene cada uno?
denpristay [2]

Answer:

La cantidad de dinero

Celia tiene = x = 9.33 €

Quique tiene = y = 4.67 €

Step-by-step explanation:

Representemos la cantidad de dinero

Celia tiene = x

Quique tiene = y

Entre Celia y Quique suman 14 €.

x + y = 14

x = 14 - y

Si Celia tuviera 1 euro, tendría el doble de dinero que Quique.

Por lo tanto,

x = 2 años

Nosotros sustituimos

2y + y = 14

3 años = 14

y = 14/3

y = 4.67 €

x = 14 € - y

x = 14 € - 4.67 €

x = 9.33 €

Por lo tanto,

La cantidad de dinero

Celia tiene = x = 9.33 €

Quique tiene = y = 4.67 €

7 0
3 years ago
Read 2 more answers
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