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love history [14]
3 years ago
15

find the value of c in the calculations below c/6 - 4/9 = 7/18 these are fractions you will get brainliest

Mathematics
1 answer:
ikadub [295]3 years ago
3 0

Answer:

c = 5

Step-by-step explanation:

c/6 - 4/9 = 7/18

Make denominators equal.

3c/18 - 8/18 = 7/18

Cancel denominators since they are equal.

3c - 8 = 7

Add 8 to both sides.

3c = 7 + 8

3c = 15

Divide 3 into both sides.

c = 15/3

c = 5

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There are 42 sixth-grade students and 60 fifth grade students. The students will be put in to the largest possible equal groups
scoundrel [369]

Answer:51 Groups

Step-by-step explanation:

60 students + 42 students = 102

102 divided by 2 = 51 Total groups.

5 0
3 years ago
Does second-hand smoke increase the risk of a low birthweight? A baby is considered have low birthweight if he/she weighs less t
marishachu [46]

Answer:

Option 2) Null hypothesis: p = 0.078 , Alternate hypothesis: p > 0.078

Step-by-step explanation:

We are given the following in the question:

According to the National Center of Health Statistics, about 7.8% of all babies born in the U.S. are categorized as low birth weight.

Sample size, n = 1200

p = 7.8% = 0.078

We have to carry a hypothesis test whether national percentage is higher than 7.8% or not.

Thus, we can design the null and the alternate hypothesis

H_{0}: p = 0.078\H_A: p > 0.078

Thus, the correct answer is:

Option 2) Null hypothesis: p = 0.078 , Alternate hypothesis: p > 0.078

5 0
3 years ago
What is 18 divided by 0.2 and how?
kati45 [8]
0.2 is the same as 2/10

18/(2/10)

As you may have learned in school, when you divide a fraction, you flip the fraction in the denominator, and change it to multiplication

18/(2/10) becomes 18 x (10/2)

multiply normally

18 x 10 = 180

divide to find answer

180/2 = 90

90 is your answer

hope this helps

Remember, when you meet this problem, flip the second fraction, and change the division sign into multiplication. (always second, never first (if first is a fraction)).
5 0
3 years ago
A sprinter can run 279 feet in 9 seconds. find the sprinter's unit rate of feet per second.
MariettaO [177]
279ft/9sec = xft/1sec
Cross multiply to get
9x = 279 divide by 9
x = 31
31 feet per second
3 0
3 years ago
Read 2 more answers
In the seventh grade, Rachel read 15 books.
andre [41]

Answer:

20%

Step-by-step explanation:

Calculate percentage change

from V1 = 15 to V2 = 18

(V2−V1)|V1|×100

=(18−15)|15|×100

=315×100

=0.2×100

=20%change

=20%increase

4 0
3 years ago
Read 2 more answers
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