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kumpel [21]
3 years ago
9

7. Let f(x)=4x+7 and g(x)=3x-5. Find (g o f )(-4) A. -61 B. -32 C. -9 D. -64

Mathematics
2 answers:
Radda [10]3 years ago
8 0
G( f(-4) )
f(-4) = -16 +7= -9
g(-9) = (3*-9)-5 = -32
NikAS [45]3 years ago
5 0

Answer:

The answer is the option B -32

Step-by-step explanation:

we have

f(x)=4x+7

g(x)=3x-5

we know that

(gof)(x)=g(f(x))

substitute

g(f(x))=3(4x+7)-5

g(f(x))=12x+21-5

g(f(x))=12x+16

Find g(f(-4))

Substitute the value of x=-4 in the equation

g(f(-4))=12(-4)+16

g(f(-4))=-32

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Lina20 [59]
I'm pretty sure $39.31 was the original sales cost because if you use proportions to find out what is 7.2% of 42.35 ( what you get you you subtract 45 by 2.65). Your equation would be x/42.35 = 7.2/100. 42.35 is the whole because tax is adding money onto your original cost, making that the part. When you cross multiply you get 100x = 304.92. Then you divide by 100 on both sides to isolate the variable, to get x = 3.04. But you don't stop there. Since 3.04 is only the 7.2%, you have to subtract that by 42. 35 to get a sum of 39. 31 as your total. 
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