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2 years ago

What is the value of 2(7-15) 4 0 0 -2 2 4

Mathematics

1 answer:

ivann1987 [24]2 years ago

3 0

Answer:

-16 should be the answer

Step-by-step explanation:

According to PENDAS you always to parentheses first so (7-15)= -8 you then multiply that by 2 and get -16.

Hope this helps.

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Help please i really really really need it.....

ruslelena [56]

s = sweater

j = jeans

Equations:

4s + 2j = 140

2s + 3j = 150

4s + 2j = 140

2s + 3j = 150

Multiply (-2) to the second equation

-2 (2s + 3j = 150)

-4s - 6j = -300

Now you have the equations:

4s + 2j = 140

-4s - 6j = -300

-----------------------------add

-4j = -160

j = 40

4s + 2(40) = 140

4s + 80 = 140

4s = 60

s = 15

The cost for a sweater is $15 and the cost for a jean is $40

We used the elimination method to solve the system of equations.

Each pair of jean, she will buy 3 sweaters so total = 40 + 3(15) = $85

Total cost for 1 pair of jeans and 3 sweaters = $85

If she has $225 the

$225 / $85 = 2.64

2 jeans = 2 x 40 = $80

6 sweaters = 6 x $15 = $90

So She can only buy 2 jeans and 6 sweaters

3 0

3 years ago

Raul has 40 toy cars in his collection.

rosijanka [135]

Answer:

Step-by-step explanation:

40-1-2=37 silver cars

6 0

3 years ago

Pls help not to sure on this one

skad [1K]

The answer is A. U basically divide the price with the amount of item and pick the cheapest one :)

3 0

2 years ago

The circumference of a circle is 16Pi ft.<br><br> The radius is <br> ft.

mafiozo [28]

8pi ft

Just divide 16 by 2 because it’s half of the diameter

6 0

3 years ago

What is the probability that a randomly selected male will have a foot length between 8 and 12.5 inches? P(8 < r < 12.5)=

melisa1 [442]

Answer:

0.8185 or 81.85%

Step-by-step explanation:

The mean length (μ) of an adult foot is 11 and the standard deviation (σ) is 1.5.

The z score is a measure in statistic used to determine the amount of standard deviation by which the raw score (x) is above or below the mean. If the raw score is above the mean, the z score is positive and if the raw score is below the mean the z sore is negative. It is given by:

$z=\frac{x-\mu}{\sigma}$

To calculate the probability that a randomly selected male will have a foot length between 8 and 12.5 inches, we first calculate the z score for 8 inches and then for 12.5 inches.

For 8 inches:

$z=\frac{x-\mu}{\sigma}=\frac{8-11}{1.5}=-2$

For 12.5 inches:

$z=\frac{x-\mu}{\sigma}=\frac{12.5-11}{1.5}=1$

From the normal distribution table, The probability that a randomly selected male will have a foot length between 8 and 12.5 inches = P(8 < x < 12.5) = P(-2 < z < 1) = P(z < 1) - P(z < -2) = 0.8413 - 0.0228 = 0.8185 = 81.85%

4 0

3 years ago