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3 years ago

I really need help please

Mathematics

1 answer:

Murljashka [212]3 years ago

3 0

There are zero terms

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X^2+y^2-4y-15=6

myrzilka [38]

Answer:

x^2 + y^2 - 4y - 15 = 6

x^2 + y^2 - 4y = 21

x^2 + y^2 - 4y + 4 = 25

x^2 + (y - 2)^2 = 5^2

r = 5

8 0

2 years ago

Một ủy ban an toàn kiểm tra ngẫu nhiên 900 công nhân xây dựng trong thời gian làm việc, thấy có 48 công nhân không mang mũ bảo h

Usimov [2.4K]

Answer:

The percentage of workers not wearing the helmets is 5.3 %.

Step-by-step explanation:

A safety committee randomly examined 900 construction workers during their work, and found that 48 workers were not wearing helmets. Estimate the percentage of workers who do not wear protective masks during their working time with 98% confidence

total workers = 900

Not wearing helmet = 48

Percentage which are not wearing the helmets

= $\frac{48}{900}\times 100 = 5.3 %$ %

6 0

3 years ago

Helpppppppp please i dont understand

RUDIKE [14]

Answer:

(a) 64 days

(b) 2 phones calls

Step-by-step explanation:

8 0

2 years ago

Read 2 more answers

The radius r of a circle is increasing at a rate of 7 centimeters per minute. (a) find the rate of change of the area when r = 1

VikaD [51]

Dr /dt = 7

A = pi r^2

dA / dr = 2pir

dA/dt = dA/dr * dr/dt = 2pir * 7 = 14pir

when r = 12 rate of change of the area = 14*pi*12 = 168pi

= 527.79 cm^2 / minute to nearest hundredth

5 0

3 years ago

How many whole numbers are between 1 and 50 that are divisible by 2?

kupik [55]

Answer:

Step-by-step explanation:

The first number in the range 1 - 50 that is divisible by 2 is 2 itself. Then 4, 6, 8, ....

Here's one way to think and count:

$2 \rightarrow 1\\4 \rightarrow 2\\6 \rightarrow 3\\8 \rightarrow 4\\\vdots\\50\rightarrow 25$

In the table, the number on the right is <u>half</u> the number on the left. The numbers on the right are just counting numbers (natural numbers), so there are 25 even numbers between 1 and 50.

8 0

3 years ago

Read 2 more answers