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Ad libitum [116K]
3 years ago
15

If z varies directly as x and z=30 when x=8 find z when x=4

Mathematics
1 answer:
dangina [55]3 years ago
8 0
Z=kx, 30=8k, so k=30/8=15/4 and z=15x/4, so when x=4, z=15.
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This year, Carmen watched 70 movies. She thought that 21 of them were very good. Of the movies she watched, what percentage did
spin [16.1K]

Carmen thought 30% of the movies were good.

I found the percent by dividing 21 by 70

21/70= .3

.3= 30%

8 0
3 years ago
At the beginning of the day, stock XYZ opened at $6.12. At the end of the day, it closed at $6.88. What is the rate of change of
Natalija [7]

Answer:

C is the correct option.

Step-by-step explanation:

We have been given that

stock XYZ opened at $6.12 and it closed at $6.88 and we have find the rate of change of stock.

Change in the value =| Initial - final |

Change in the value = |6.12-6.88|

Change in the value = 0.76

Hence, the rate of change of stock is given by

\frac{\text{Change in value}}{\text{initial value}}\times100\\\\=\frac{0.76}{6.12}\times100\\\\=12.4\%

C is the correct option.


7 0
2 years ago
What is 6y - 12 = -3x in standard form?
lakkis [162]
To get it into standard you need to simplify
6y - 12 = -3x add 12 to both sides
6y = -3x + 12 add 3x to both sides
3x + 6y = 12
And that is in standard which is A + B = C
6 0
3 years ago
40 is 20% if what number?
Mamont248 [21]

Answer:

200

Step-by-step explanation:

Use the ratio: 20/100 = 40/X

Simplify the ratio: 1/5 = 40/X

Cross Multiply: 1X = 200

Divide both sides by 1: 1X/1 = 200/1

Simplify: X = 200

6 0
3 years ago
Please help me! I’ll mark brainliest.
soldi70 [24.7K]

Answer:

A- 16 songs a day

B- 32 songs in the weekend

Step-by-step explanation:

A- if she songs "jingle bells" 5 times, the sings"silver bells" twice as many times, that would just be like multiplying  5 x 2, which equals 10, then add the 5 times she sings jingle bells, that would be 15. then she sings "silent night" one time which adds on to the other songs to get 16 songs a day

B- the weekend has 2 days in it so you would just multiply 16 x 2 which gives you 32

5 0
2 years ago
Read 2 more answers
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