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Kipish [7]
3 years ago
7

For all the values of x, f(x)=x²+3 g(x)=2x-1 a) find fg(2) b) find gf(2)

Mathematics
1 answer:
erik [133]3 years ago
5 0

Answer:

12 and 13

Step-by-step explanation:

(a)

To evaluate f(g(2)), evaluate g(2) then use the value obtained to evaluate f(x)

g(2) = 2(2) - 1 = 4 - 1 = 3, then

f(3) = 3² + 3 = 9 + 3 = 12

--------------------------------------------

(b)

To evaluate g(f(2)), evaluate f(2) the use the value obtained to evaluate g(x)

f(2) = 2² + 3 = 4 + 3 = 7, then

g(7) = 2(7) - 1 = 14 - 1 = 13

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What is 5x + 5 + 5x = -75
Dafna11 [192]

Answer:

-8

Step-by-step explanation:

first combine like terms 5x+5x=10x

then subtract 5 from -75= -80

divide -80 by 10= -8

you are left with -8=x

4 0
3 years ago
Which ordered pair is the solution to the system
svetoff [14.1K]

Answer:

2 ordered pairs are solutions:

(1, -11) and (3, -9)

Step-by-step explanation:

6 0
3 years ago
at an animal shelter there are 15 dogs 12 cats 3 snakes and 5 parakeets. what percent of the number of cats is the number of sna
dsp73
Percentage of cats
\frac{# animals}{#cats} = \frac{100}{?}
\frac{35}{12}=  \frac{100}{?} 

**cross multiply 12 and 100 which is 1200
**divide 35 into 1200
the answer is 34.3% when rounded

percentage of snakes
\frac{# animals}{#snakes} = \frac{100}{?}
**cross multiply 3 and 100 which is 300
<span>**divide 35 into 300</span>
<span>\frac{35}{3}= \frac{100}{?}
</span>the answer is 8.57%
7 0
3 years ago
How do you simplify the expression 6(3-y)
Crank
Subtract 3 from y you get 6(-y)
6*y=6y

5 0
3 years ago
Read 2 more answers
100 POINTS! PLEASE HELP!
Nana76 [90]

Answer:

1. x=5. 2. x=3

Step-by-step explanation:

Ok, so I actually spent 2 hours doing the first problem, I considered the angles to be different at first, i will add my messy work if you are interested haha.

However, I realized that the only way this question can be possible to solve is if the angles are equal, and there is no information given to say that they are different (they are both indicated by one line, while angles that are different are usually represented with multiple lines).

The general method for such problems is to consider the ratio of the sides to the side lengths into which the long side is divided.

For the first picture, the answer can be found by: 9/(2x-1) = 15/(3x). From here, we find that x = 5 (do some algebra). I actually got the same answer when doing this problem with the sine rule.

I am only looking now at the second problem, and i can tell straight away that we can get the solution by solving 3/2.25 = 4/x. x = 3 after some algebraic manipulation.

So yeah, this was a not so fun experience of trying to do this problem without knowing the angles were equal, but i learned a lot haha :)

PS. I am only adding my terrible working out because i hate myself for being so silly

7 0
2 years ago
Read 2 more answers
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