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ser-zykov [4K]
4 years ago
7

Bryan decides he wants to help pay for a birthday party for his little brother at the ice rink. It cost $50 to rent the party ro

om and then $4 for each person attending. Bryan only has $100 to spend at the party. a) What are the constraints for this situation? b) Find the domain and range for this situation. Make sure you include all values for each using correct notation.
Mathematics
1 answer:
Anastaziya [24]4 years ago
7 0

Answer:

a) 4*x + 50 ≤ 100  

b) Domain   x (0 ; 12 )     Range   f(x)   ( 50  ; 98 )

Step-by-step explanation:

The constraint is:

4*x + 50 ≤ 100                   where "x" is the number of persons

b) Domain for x

x = 0    up to  x = 12           x (0 ; 12 )

c) Range for f(x)

f(x) = 4*x + 50

f(0)  = 4*0 + 50      f(0) =  50

f(12) = 4*12 + 50    f (12) =  98

f(x)   ( 50  ; 98 )

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It is known that for all tests administered last​ year, the distribution of scores was approximately normal with mean 74 and sta
Lunna [17]

Answer: 19.77%

Step-by-step explanation:

Given: Mean : \mu=74

Standard deviation : \sigma = 7.1

The formula to calculate z-score is given by :_

z=\dfrac{x-\mu}{\sigma}

For x= 80, we have

z=\dfrac{80-74}{7.1}\approx0.85

The P-value = P(z>0.85)=1-P(z

In percent , 0.1976626\times100=19.76626\%\approx19.77\%

Hence, the approximate percentage of the test scores during the past year exceeded 80 =19.77%

6 0
3 years ago
Can you please help me ​
kkurt [141]

Answer:

a) x=

10°

50°

130°

10°

50°

130°

170°

250°

290°

b) x=

90°

210°

330°

Step-by-step explanation:

2 sin (3x) = 1

a)  look at the graph, y=1 when x is near:

10°,  50°, 130°, etc

in the equation: 2 sin (3x) = 1  ⇒ sin (3x) = 0.5  ⇒ 3x = 30° (and others)  ⇒ x = 10° (and others).  So the values given in solution (10°,  50°, 130°, etc) are true

b) is evident

8 0
3 years ago
Write an equation of the perpendicular bisector of the segment with the endpoints (8,10) and ( -4,2).
ale4655 [162]

Answer:

The required equation is:

y = -\frac{3}{2}x+9

Step-by-step explanation:

To find the equation of a line, the slope and y-intercept is required.

The slope can be found by finding the slope of given line segment. A the perpendicular bisector of a line is perpendicular to the given line, the product of their slopes will be -1 and it will pass through the mid-point of given line segment.

Given points are:

(x_1,y_1) = (8,10)\\(x_2,y_2) = (-4,2)

We will find the slope of given line segment first

m = \frac{y_2-y_1}{x_2-x_1}\\= \frac{2-10}{-4-8}\\=\frac{-8}{-12}\\=\frac{2}{3}

Let m_1 be the slope of perpendicular bisector then,

m.m_1 = -1\\\frac{2}{3}.m_1 = -1\\m_1 = \frac{-3}{2}

Now the mid-point

(x,y) = (\frac{x_1+x_2}{2} , \frac{y_1+y_2}{2})\\= (\frac{8-4}{2} , \frac{10+2}{2})\\=(\frac{4}{2}, \frac{12}{2})\\=(2,6)

We have to find equation of a line with slope -3/2 passing through (2,6)

The equation of line in slope-intercept form is given by:

y = m_1x+b

Putting the value of slope

y= -\frac{3}{2}x+b

Putting the point (2,6) to find the y-intercept

6 = -\frac{3}{2}(2)+b\\6 = -3+b\\b = 6+3 =9

The equation is:

y = -\frac{3}{2}x+9

7 0
3 years ago
Which price is cheaper? 20% off the original price of $29.99 or 10% off the original price of $26 for a book?
Archy [21]
20% off means that now it costs 80% of original price
80% = 0.8
costs 80% of (means here times (*))original price
29.99*0.8≈23.99

10% off means that now it costs 90% of original price
90%=0.9
costs 90% of (means here times (*))original price
26*0.9=23.40
23.99>23.40,
so is 
<span> 10% off the original price of $26 is cheaper</span>
3 0
3 years ago
Janine knows that in 2 weeks, her family will need her to work at the restaurant for 8 hours. If Janine can babysit in increment
Artyom0805 [142]

Answer:

How much does she earn per 30 minutes?

5 0
3 years ago
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