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Helga [31]
3 years ago
10

Evaluatef(x) = 2.5x-11 when x = 4

Mathematics
1 answer:
seraphim [82]3 years ago
6 0

Answer:

-1

Step-by-step explanation:

f(4) = 2.5(4) -11

f(4) = 10 -11

f(4) = -1

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Car A, traveling at a constant 10 m/s, crosses the start line 3 seconds before Car B, who is traveling at a constant 15 m/s. At
Margaret [11]
The distance between Car A and car B,When Car A crosses the start line is:
distance =speed car B* time
distance=(15 m/s)(3 s)=45 m
 
Distance traveled by car A =x,  (when the car B is at the same distance from the start line)
time of car A=t

x=10 m/st  ⇒    x=10t    (1)

Distance traveled by car B=x
time of car B=t-3

x=15(t-3)  (2)

With the equations (1) and (2) we make a system of equations:

x=10t
x=15(t-3)

We solve this system of equations:

10t=15(t-3)
10t=15t-45
-5t=-45
t=-45 / -5
t=9

t-3=9-3=6

x=10 t=10 (9)=90

Answer: The time would be 9 seconds for Car A and 6 seconds for car B and the distance would be 90 meters.
8 0
3 years ago
(-6, 1) and 3, 5)<br> M= rise/run=(y2-y1)/(x2-x1)
Sergeeva-Olga [200]

Answer:

4/9

Step-by-step explanation:

The slope of these points would be: (5-1)/(3+6) = 4/9

7 0
3 years ago
Myra takes 2hours to plant 50 flower bulbs. Francis takes 3 hours to plant 45 flower bulbs. Working together, how long should it
crimeas [40]

Answer:37 and half hrs


Step-by-step explanation:


This is what I get


Myra: 50/2= 25 bulbs/hr.

Francis: 45/3= 15 bulbs/ hr


25+15= 40/hr. Together per hr

Need to find 150 bulbs how many hrs


40/1=150/t

40t=150

T= 150/4

T= 37.5


37hrs and 1/2


4 0
3 years ago
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fiasKO [112]

Answer:

Step-by-step explanation:

its wierd but 2.22

8 0
3 years ago
F(x)=-(x+7)^2+4 which of the following
solmaris [256]

Answer:

(x+7)^2+4

Step-by-step explanation:

(x+7)^2 + 4

x^2+14x+49+4

x^2+24x+53

3 0
2 years ago
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