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3 years ago

12

HELP!! I need to do this today (Show steps) first answer gets BRAINLY

1 answer:

ELEN [110]3 years ago

6 0

Answer:

A. 7.50 per box

Step-by-step explanation:

We know that when there are 4 boxes, we make 30 dollars. Divide 4 from 30 to get 30/4 which is equal to 7.5. This means we make 7.5 dollars per box.

If this helps please mark as brainliest

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Circumference of a circle with a radius of 5 inches

Fudgin [204]

Circumference of a circle with a radius of 5 inches is 31.42 in.
You can express that by writing C <span>≈ 31.42 in.
I hope you find this answer the most helpful.</span>

8 0

3 years ago

Read 2 more answers

For males in a certain town, the systolic blood pressure is normally distributed with a

mario62 [17]

Answer:

99.7%

Step-by-step explanation:

According to the Empirical Rule:

68% of data in a normal distribution are ±1σ from the mean μ
95% of data in a normal distribution are ±2σ from the mean μ
99.7% of data in a normal distribution are ±3σ from the mean μ

By calculating the z-score of each observed value, we can determine how many standard deviations these observed values are from the mean:

$\displaystyle Z=\frac{\text{Observed Value}-\text{Mean of the Sample}}{\text{Standard Deviation of the Sample}}\\\\Z=\frac{99-120}{7}\\ \\Z=\frac{-21}{7}\\\\Z=-3$

$\displaystyle Z=\frac{\text{Observed Value}-\text{Mean of the Sample}}{\text{Standard Deviation of the Sample}}\\\\Z=\frac{141-120}{7}\\ \\Z=\frac{21}{7}\\\\Z=3$

Clearly, we can see that 99.7% of males in the town have a systolic blood pressure between 99 and 141 by the Empirical Rule.

7 0

2 years ago

Write an equation and solve: Your math homework has 6 more than three times the number of problems you have on your history work

love history [14]

Answer:

33 math problems

Step-by-step explanation:

Let's set a few variables:

Number of math problems = m

Number of history problems = h

We know that in total, we have 42 problems.

m + h = 42

We also know that our math homework has 6 problems more than 3 times the number of history problems.

m = 3*h + 6

So m is 3 times h, plus 6.

m + h = 42

We can subtract h from both sides of this equation.

m = 42 - h

Now we can put this value for m, 42-h, into our other equation.

m = 3*h + 6

42 - h = 3*h + 6

Subtracting 6 from both sideS:

36 - h = 3*h

Adding h to both sides:

36 = 3*h + h

36 = 4*h

Dividing both sides by 4:

9 = h

h = 9

We know that the number of math problems is the following:

m = 42 - h

Let's put the value for h, 9, into this equation:

m = 42 - 9

m = 33

Answer: 33 math problems

5 0

3 years ago

A 30-meter high building sits on top of a hill. The angles of elevation of the top and bottom of the building from the same spot

Vladimir79 [104]

<h2>A 30-meter high building sits on top of a 151.52 meter high hill.</h2>

Explanation:

According to the given data, we can draw a figure (Please refer the attachment below)

Building's height = 30 meter

Angle of elevation from a spot to the top of the building = 55 degrees

Angle of elevation from the spot to the top of the building = 50 degrees

To find the height of the hill, we need to use the formula,

$tan \,\theta = \frac{opposite \,side}{adjacent \,side}$

then, $tan \,50 = \frac{h}{x}$

$\Rightarrow x = \frac{h}{tan 50}$

$\Rightarrow x = \frac{h}{1.192}$ .... (1)

Similarly, $tan \,55 = \frac{30+h}{x}$

$\Rightarrow x = \frac{30+h}{tan 55}$

$\Rightarrow x = \frac{30+h}{1.192}$ .... (2)

(1) = (2) becomes

$\frac{h}{1.192} = \frac{30+h}{1.428}$

[tex]\Rightarrow [tex] 1.428h = (30 + h)1.192

1.428h = 35.76 + 1.192h

1.428h - 1.192h = 35.76

0.236h = 35.76

h = 151.52 meter

Therefore, the hill highs 151.52 meter.

4 0

3 years ago

Using factor theorem, factorise x⁴-x³-7x²+x+6

andrew11 [14]

Answer:

Add and subtract the second term to the expression and factor by grouping .

(x-1)(x+1)(x-3)(x+2)

8 0

4 years ago

Read 2 more answers