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3 years ago

Eight less than 7 times a number is -29.

Mathematics

1 answer:

andrezito [222]3 years ago

6 0

Answer:

7x-8=-20

Step-by-step explanation:

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39 rounded to the nearest tenth

alexgriva [62]

The correct answer is 39.0

3 0

4 years ago

Evaluate 18×2-4^2 ÷8

Delvig [45]

Answer:

Step-by-step explanation:

Order of Operations: BPEMDAS

Step 1: Write out equation

18 × 2 - 4² ÷ 8

Step 2: Exponents

18 × 2 - 16 ÷ 8

Step 3: Multiply

36 - 16 ÷ 8

Step 4: Divide

36 - 2

Step 5: Subtract

5 0

3 years ago

A scientist inoculates mice, one at a time, with a disease germ until he finds 3 that have contracted the disease. If the prob

UkoKoshka [18]

Answer:

The probability that 8 mice are required is 0.2428.

Step-by-step explanation:

Given : A scientist inoculates mice, one at a time, with a disease germ until he finds 3 that have contracted the disease. If the probability of contracting the disease is two sevenths.

To find : What is the probability that 8 mice are required? The probability that that 8 mice are required is nothing ?

Solution :

Applying binomial distribution,

$P(X=r)=^nC_r p^rq^{n-r}$

Where, p is the probability of success $p=\frac{2}{7}$

q is the probability of failure q=1-p, $q=1-\frac{2}{7}=\frac{5}{7}$

n is total number of trials n=8

r=3

Substitute the values,

$P(X=3)=^8C_3 (\frac{2}{7})^3 (\frac{5}{7})^{8-3}$

$P(X=3)=\frac{8!}{3!5!}\times \frac{8}{343}\times (\frac{5}{7})^{5}$

$P(X=3)=\frac{8\times 7\times 6}{3\times 2\times 1}\times \frac{8}{343}\times \frac{3125}{16807}$

$P(X=3)=0.2428$

Therefore, the probability that 8 mice are required is 0.2428.

5 0

4 years ago

There is 2 and 3/4 punds of roast beef and 1 and 7/8 pounds of turkey and 2 1/16 pounds of salami if you must put 1/4 of pound o

rosijanka [135]

2 and 3/4 punds of roast beef 2 3/4 = (4x2) + 3 /4= 11/4 roast beef

1 and 7/8 pounds of turkey 1 7/8 = 15/8 turkey

2 1/16 pounds of salami 2 1/16 33/16 salami

if you put 1/4 of pound of meat
then 11/4 roast beef divided by 1/4 = 11/4 x4 = 11 sandwiches roast beef

15/8 turkey divided 1/4 = 15/8 x 4 = 15/2 = 7 sandwishes

33/16 salami divided 1/4 = 33/16 x 4 = 33/ 4 = 8 sandwiches

8 0

4 years ago

If f(x) = 2x and g(x)=1/x, what is the domain of (f o g)(x)?

Svetach [21]

(X)=2X-ALL real numbers except x=0x<_0

5 0

3 years ago

Eight less than 7 times a number is -29.​

Eight less than 7 times a number is -29.