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Yakvenalex [24]
3 years ago
13

A music store is having a sale where you can buy 2 new-release CDs for $15. How much will 7 CDs cost? Use at least 2 ways to sho

w your answer.
Mathematics
2 answers:
Pavlova-9 [17]3 years ago
7 0

Answer: $52.50

Step-by-step explanation:

1 way : 15 divided by 2 then multipy your answer by 7

2nd way : 15x7. Once you get that answer divide it by 2 to get $52.50

Andreyy893 years ago
7 0
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Tyler used 17.04 gallons of gas.Maria used 6.2 times as many gallon of gas as Tyler. How many gallons of gas did Maria use?
slava [35]
Tyler (T)= 17.04 gallons
Maria=6.2(T), Maria= 6.2x17.04=105.65 gallons
6 0
3 years ago
A small ball floats on the surface of the water in a wave pool. As a wave moves past the ball, the ball's
stiks02 [169]

Answer:

The correct option is;

d(t) = 6·cos(π/3·t) + 28

Step-by-step explanation:

The general form of a cosine function is given as follows;

y = A·cos(B·x - C) + D

Where;

A = The amplitude = The distance from the peak to the midline = 1/2×(Maximum - minimum)

The amplitude = 1/2 × (34 - 22) = 6 inches

B = 2·π/P = 2·π/6 = π/3

P = The period = 6 seconds

C/B = The phase shift

D = The midline = Minimum  + Amplitude = 22 + 6 = 28 inches

x = The independent variable

Therefore, to model the function of the wave can be given as follows;

d(t) = 6·cos(π/3·t) + 28

6 0
2 years ago
The height of a triangle is 4 feet less than the length of its base, b. The area of the triangle is 30 square feet.
Papessa [141]

Answer:

base(b)=10 and height(h)=6

Step-by-step explanation:

From the question,

base(b)=x feet

height(h)=(x-4) feet

Area(A)=30 square feet

Now,

We know,

Area of triangle(A)=1/2*b*h

or, 30=1/2*x*(x - 4)

or, 30=1/2*x^2 -4x

or, 30*2=x^2 -4x

or, 60=x^2 -4x

or, 0 = x^2 -4x -60

or, 0 = x^2 +6x - 10x -60

or, 0 = x(x + 6) -10(x + 6)

or, 0 = (x+6) (x-10)

Either,

x+6=0. or, x-10=0

or,x= -6. or, x= 10

Since, the base of the triangle can not be negative number then, x≠ -6feet but x=10feet

Lastly,

Height(h)=X - 4

=10 - 4

=6 feet

8 0
2 years ago
Events A and B are independent. Find the missing probability.
STALIN [3.7K]
P(A)=0.2
P(B)=0.3
P(A and B)= 0.2 x 0.3=0.06
4 0
3 years ago
Find the cost per roll if a bag of five lunch rolls is $2.50
Arturiano [62]

Answer:

$ 0.50

Step-by-step explanation:

Cost of 5 lunch rolls = $ 2.50

Cost of 1 roll

= 2.50 / 5

= $ 0.50

3 0
2 years ago
Read 2 more answers
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