All categories

3 years ago

80 + ? + -30 = 0 whats in the middle

Mathematics

1 answer:

Dmitry [639]3 years ago

6 0

Answer: The answer is -50

because 80 + -50 = 30 and 30 + -30= 0 .

You might be interested in

10 small and 8 large cost $192. 20 small and 1 large cost $99. What is cost of a small

seraphim [82]

Answer:

Step-by-step explanation:

small=s, s=3.99

large=l, l=19.20

10s+8l=192.20

20s+l=99

we can see that in the second equation, 20s+l=99

l=99-20s

lets replace l in the first equation

10s+8(99-20s)=192.20

10s+792-160s=192.20

-150s=-792+192.20

150s=599.80

s=3.99

l=99-20(3.99)=99-79.80=19.20

7 0

3 years ago

Read 2 more answers

Plz help me well mark brainliest if correct!!

Rufina [12.5K]

Answer:

1 hour

Step-by-step explanation:

Each graph shown lasts for 1/2 hour / 30 minutes

4 0

4 years ago

Miss Johnson bought a pair of jeans on sale for $30. The original price was $50. By what percent did the price of the jeans chan

svetlana [45]

Answer:

the price changed by 40%

6 0

3 years ago

Read 2 more answers

The first train leaves the station at 6:15 a m. The second train leaves at 6:55 am. How much does the sec ond train leave the st

Alekssandra [29.7K]

Answer: 40

Step-by-step explanation:

second train leaves 40 minutes after

7 0

3 years ago

The owner of a restaurant is reviewing customer complaints. In a random sample of 227 complaints, 57 complaints were about the s

iragen [17]

Answer:

$0.1375$ to $0.3624$

Step-by-step explanation:

Given :The owner of a restaurant is reviewing customer complaints. In a random sample of 227 complaints, 57 complaints were about the slow speed of the service.

To Find :Create a 95% confidence interval for the proportion of complaints that were about the slow speed of the service.

Solution:

n = 227

x = 57

Formula of confidence for proportion: $\widecap{p}-z_{\frac{\alpha}{2}}\sqrt{\frac{\widecap{p}\widecap{q}}{n}}$ to $\widecap{p}+z_{\frac{\alpha}{2}}\sqrt{\frac{\widecap{p}\widecap{q}}{n}}$