Answer:
12
Step-by-step explanation:
f(x) = 3x
f(4) = 3(4) = 12
just need to sub in the x value :)
Topic: Functions
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Answer:
$63.45
Step-by-step explanation:
first, find 470% of 15. 470*15=$70.50. then, find 10% of it. 70.50 divided by 10 = $7.05. then subtract it from the new price to get the final price. 70.50 - 7.05 = $63.45
Answer (x,y) (3, -2)
Explanation:
using the
substitution method
y
=
x
−
5
→
(
1
)
y
=
−
2
x
+
4
→
(
2
)
since both equations are expressed in terms of x we
can equate them
⇒
x
−
5
=
−
2
x
+
4
add 2x to both sides
2
x
+
x
−
5
=
−
2
x
+
2
x
+
4
⇒
3
x
−
5
=
4
add 5 from both sides
3
x
+
5
−
5
=
4
+
5
⇒
3
x
=
9
divide both sides by 3
3
x
3
=
9
3
⇒
x
=
3
substitute this value in
(
1
)
y
=
3
−
5
=
−
2
As a check
substitute these values into
(
2
)
right
=
−
6
+
4
=
−
2
=
left
⇒
point of intersection
=
(
3
,
−
2
)
Answer:
The second one (4+3x = 9)
Step-by-step explanation:
From the working we can already tell that the second one is the odd one out without even doing the 4th one
Number of bag = x
Then, number of candies & Strickers would be 6x & 12x respectively..
