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atroni [7]
3 years ago
8

If f(x) = 5x + 40, what is f(x) when x = –5? –9 –8 7 15

Mathematics
2 answers:
Gnoma [55]3 years ago
5 0
Hi,

f(x)=5x+40\\\\f(-5)=5\times(-5)+40=-25+40=15\\f(-9)=5\times(-9)+40=-45+40=-5\\f(-8)=5\times(-8)+40=-40+40=0\\f(7)=5\times7+40=35+40=75\\f(15)=5\times15+40=75+40=115
scoray [572]3 years ago
4 0
The Answer is 15. You're welcome kidz
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If (x+4)*2=49 and x&lt;0, what is the value of x
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Answer:

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3 years ago
Find each function value<br><br>1. f(7) if (x)=5x<br><br>2. f(4) if f(x)=3x-1
Inessa [10]

<u>ANSWER</u>

1. \:  \: f(7) = 35

2. \: f(4) = 11

<u>EXPLANATION</u>

To find the value of a function, f(x) at a given value x=a, we plug in x=a into f(x) to obtain f(a) in simplified form.

The first function is

f(x) = 5x

To find f(7), we substitute x=7, into the function.

\implies f(7) =5(7) =  5 \times 7 = 35

The second function is

f(x) = 3x - 1

To find f(4), we replace x with 4 to obtain,

f(4) = 3(4) - 1

f(4) = 12 - 1 = 11

6 0
3 years ago
Cost of boots: $99.99 Markup: 9% What is the new cost
mote1985 [20]

Answer:

The new cost is $108.98

Step-by-step explanation:

Mark up is the amount that is added to cost price of a product for profit.

Given

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First of all we will calculate markup and then add it to the cost price of boots to find the new cost.

Mark\ up = M = 9\%\ of\ 99.99\\= 0.09*99.99\\=\$8.99

The new cost will be:

C_n = Cost\ price + mark\ up\\C_n = 99.99+8.99\\= 108.98

The new cost is $108.98

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type 150 divide by 100 times 25
minus that from 150
and it gives you the answer
6 0
3 years ago
Read 2 more answers
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