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Montano1993 [528]
3 years ago
12

3 points

Mathematics
1 answer:
stich3 [128]3 years ago
6 0

Step-by-step explanation:

2x + 100 = 90

x = -5

Angle A = 45 - 5 = 40.

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If a varies directly as b and a=3 when b=12, what is the value of a when b=18?
Zepler [3.9K]

Answer:

a is proportional to b

a=kb

k is proportionality constant

k =a/b =3/12 =1/4

k=1/4 = a/b=a/18

1/4=a/18

a=18/4 =9/2 =4.5 answer

4 0
3 years ago
To find the value of r, Stephen rewrites 3r - 18 = 27 as 3(r - 6) = 3(9). How could this help Stephen reason the value of r? Exp
Leokris [45]

Answer: See explanation

Step-by-step explanation:

We are informed that Stephen rewrites 3r - 18 = 27 as 3(r - 6) = 3(9). This is quite thoughtful of Stephen and it's an easier way to solve the question.

In this case, 3 is a common factor to 3r, 18 and 27. Therefore, we will then have: 3(r - 6) = 3(9).

Since 3 is a common base to both, we are more concerned with the values inside the brackets. This will be:

r-6 = 9

r = 9 + 6

r = 15

Check: 3r - 18

3(15) - 18 = 45 - 18 = 27

3 0
3 years ago
Write a decimal where the value of a digit is 1/10 as much as a digit in another place
zmey [24]
The answer would be .66
6 0
3 years ago
To begin a bacteria study a petri dish had 2200 bacteria cells every hours since the number of cells has increased by 3.8% let t
WINSTONCH [101]

Answer:

Therefore the required relationship is

y = 2000(1.038)^t

Step-by-step explanation:

Given that, to begin a bacteria study a petri dish had 2200 bacteria cells every hours.

The growth of bacteria is in exponential.So we use the following formula

A=P(1+r)^n

A= Total amount =y = the number of bacteria cell

P= initial value = 2000

r= rate of increase = 3.8%= 0.038

n = time = t

Putting the all values

y=2000(1+0.038)^t

\Rightarrow y = 2000(1.038)^t

Therefore the required relationship is

y = 2000(1.038)^t

8 0
3 years ago
What is 47.358 in word form
Valentin [98]
Forty-seven point three five eight.

I hope you like this answer, and have a good night and life! :D
4 0
3 years ago
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