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Bess [88]
3 years ago
11

A mobile phone company uses the formula C = 10t + 20m to calculate the total cost of a bill. C is the total cost of the bill in

pence. t is the number of text messages. m is the number of minutes of call time. Calculate the total cost for 150 texts and 50 minutes of call time.
Mathematics
1 answer:
Irina-Kira [14]3 years ago
3 0

Total Cost C = 10*150 + 20*50

=  2500   pence

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Given f(x) = the quantity of 2x minus 2 divided by 4, solve for f−1(3).
spin [16.1K]
Given: f(x)=(2x-2)/4
find f^-1(3)?
we need to find the inverse of f(x), so
x=(2y-2)/4
2y-2=4x
y-1=2x
y=2x+1
so, then f^-1(x)=2x+1
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6 0
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What is the definition of union and intersection
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Step-by-step explanation:

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3 years ago
Which of the statements below is true for the following set of numbers 20,5,50,95,75,60
alina1380 [7]

Answer:

they are all multiples of 5

Step-by-step explanation:

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3 0
3 years ago
19,000 is invested in anaccount for 30 years. Find the value of the investment at the end of 30 years if the interest is 7% simp
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From the top of a 100 ft air traffic control tower, an airplane is observed flying in at an angle of 32\displaystyle \degree°. I
dolphi86 [110]

Answer:

1974.6 feets

Step-by-step explanation:

The plane's altitude is : h + 100 feets

To obtain h, according to the attached picture ;

We can use trigonometry :

Tan θ = opposite / Adjacent

Opposite = h ; adjacent = 3000 feets

Tan 32° = h / 3000

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h = 1874.6080

Plane's altitude :

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4 0
3 years ago
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