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Alex_Xolod [135]
4 years ago
7

Factor the expression using the GCF 21+15

Mathematics
1 answer:
Svet_ta [14]4 years ago
6 0

Answer:

3(7+5)

Step-by-step explanation:

21+15

Each term is divisible by 3

3*7 +3*5

3(7+5)

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How do u rewrite 0.72 repeating as a simplified fraction?
vampirchik [111]
8/11 is the answer

I use this trick: When tryig to find repeating numbers divide by 11 or 9

When dividing by 9 the numerator will be the first number in the decimal

When dividing by 11 the numerator will be one more than the first number in the decimal
8 0
3 years ago
Plz plz plz help i feel so dumb doing this
Lemur [1.5K]

Answer:

the last side is 30 inches

Step-by-step explanation:

3 0
3 years ago
Suppose the probability of being infected with a certain virus is 0.001. A test used to detect the virus is positive 99% of the
charle [14.2K]

Answer:

P (A ║ B)  = 1.98 %

Step-by-step explanation:

Bayes´ Theorem  express

P (A ║ B)  =  P(A) * P( B ║ A) / P(B)

Now we identify

Event A  person infected with a virus. Probability of being infected by a virus is  P/A)  0.001

Event B  the test was positive. Probability of test positive  P(B)  = 0,05

Probability of  P ( B║ A)  is the porbability of test positive given that is infected   = 0.99

Then by subtitution in a general equation of the theorem we have

P (A ║ B)  =  0.001*0.99/ 0.05

P (A ║ B)  =  0.0198          P (A ║ B)  = 1.98 %

5 0
4 years ago
Read 2 more answers
Use the substitution method to solve the system of equations. Choose the correct ordered pair.
motikmotik
Ur gonna have to pick an equation and solve for a variable.

2x - 2y = 6
2x = 2y + 6 ...divide everything by 2 because u want x by itself
x = y + 3

now we sub y + 3 in for x in the other equation
14x - 2y = 78
14(y + 3) - 2y = 78...distribute thru the parenthesis
14y + 42 - 2y = 78...subtract 42 from both sides, cancelling the 42 on the left
        -42          -42
-----------------------
14y - 2y = 36 ...simplify
12y = 36...divide by 12 on both sides, cancelling out the 12 on the left
y = 36/12
y = 3

now , we already know that x = y + 3...and we know y = 3...so sub in 3 for y and solve for x
x = y + 3
x = 3 + 3
x = 6

solution is (6,3)

it is always a good idea to check ur answer by subbing it into one or both of the equations to see if it is correct
2x - 2y = 6......(6,3)...x = 6 and y = 3
2(6) - 2(3) = 6
12 - 6 = 6
6 = 6 (correct)

so yes, ur solution is (6,3)
4 0
3 years ago
Read 2 more answers
pls help me do if u don't know how to do pls don't answer or else u will be reported I need it under 25min thank u​
Vesna [10]

Answer:

see explanation

Step-by-step explanation:

given that V is directly proportional to u and inversely proportional to f , then the equation relating them is

V = \frac{ku}{f} ← k is the constant of proportion

(a)

to find k use the condition when u = 1 and f = 3 , V = \frac{1}{6} , then

\frac{1}{6} = \frac{k}{3} ( cross- multiply )

6k = 3 ( divide both sides by 6 )

k = \frac{3}{6} = \frac{1}{2}

V = \frac{u}{2f} ← equation of proportion

(b)

when f = 4 and V = 1 \frac{1}{4} = \frac{5}{4} , then

\frac{5}{4} = \frac{u}{2(4)} = \frac{u}{8} ( cross- multiply )

4u = 40 ( divide both sides by 4 )

u = 10

5 0
2 years ago
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