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bezimeni [28]
3 years ago
13

2a - 7 - 6a = 9 Pls help?

Mathematics
1 answer:
slavikrds [6]3 years ago
3 0

Step-by-step explanation:

2a - 7 - 6a = 9

- 4a - 7 = 9

- 4a = 16

a = -4

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Suppose that your net income for the month is $1,500 and that your total expenses are $2,500
Aleks [24]

Answer:

You will need to double your net income in order to make a profit.

Step-by-step explanation:

1500 x 2 = 3000 - 2500 = 500 which is 500 dollars profit

6 0
3 years ago
A certain disease occurs most frequently among older women. Of all age groups, women in their 60s have the highest rate of breas
Law Incorporation [45]

Answer:

The probability that a woman in her 60s has breast cancer given that she gets a positive mammogram is 0.0276.

Step-by-step explanation:

Let a set be events that have occurred be denoted as:

S = {A₁, A₂, A₃,..., Aₙ}

The Bayes' theorem states that the conditional probability of an event, say <em>A</em>ₙ given that another event, say <em>X</em> has already occurred is given by:

P(A_{n}|X)=\frac{P(X|A_{n})P(A_{n})}{\sum\limits^{n}_{i=1}{P(X|A_{i})P(A_{i})}}

The disease Breast cancer is being studied among women of age 60s.

Denote the events as follows:

<em>B</em> = a women in their 60s has breast cancer

+ = the mammograms detects the breast cancer

The information provided is:

P(B) = 0.0312\\P(+|B)=0.81\\P(+|B^{c})=0.92

Compute the value of P (B|+) using the Bayes' theorem as follows:

P(B|+)=\frac{P(+|B)P(B)}{P(+|B)P(B)+P(+|B^{c})P(B^{c})}

            =\frac{(0.81\times 0.0312)}{(0.81\times 0.0312)+(0.92\times (1-0.0312)}\\

            =\frac{0.025272}{0.025272+0.891296}

            =0.02757\\\approx0.0276

Thus, the probability that a woman in her 60s has breast cancer given that she gets a positive mammogram is 0.0276.

4 0
3 years ago
Read 2 more answers
A sphere of radius 2x m has an area of ​​152.4 m2 and a volume of 360.9 m3. How much will the area and volume of another sphere
SpyIntel [72]

Answer:

I don't know what's going on at all possible for you

6 0
3 years ago
Nth term of 70, 100, 130
BlackZzzverrR [31]

Answer:

a1 = 70

a2 = 100

a3 = 130

an = 70 + 30(n - 1)

6 0
3 years ago
Please help, thanks.​
Liula [17]

Answer:

\frac{ - 5}{54}  +  \frac{5 \times 6}{9 \times 6}  =  \frac{ - 5 + 30}{54}  =  \frac{25}{54}

\frac{15}{4}   \div  \frac{3}{8}  =  \frac{15}{4}  \times  \frac{8}{3}  =  10

10 \times  \frac{25}{54}  =  \frac{250}{54}  = 4 \times \frac{17}{27}

b )

4 \times \frac{17}{27}  =  \frac{125}{27}  =

cube root =

\frac{5}{3}

c ) square root

\frac{125}{27}  =  \frac{ \sqrt{25 \times 5} }{ \sqrt{3 \times 9} }  =  \frac{5 \sqrt{5} }{3 \sqrt{3} }

3 0
3 years ago
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