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Lunna [17]
3 years ago
10

I need help with this math.....​

Mathematics
1 answer:
stellarik [79]3 years ago
4 0
What grade level is this for? I may be able to help.
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i am confused i don't know how to solve this maybe someone on here can solve it but here is it Solve. 21r<7
DiKsa [7]

Answer:

r<-3

Step-by-step explanation:

5 0
3 years ago
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At the start of the day there was £129.75 in the till. One hour later there is £145.50. How much money did the shop make in an h
Marina86 [1]

Answer:

£15.75

Step-by-step explanation:

£145.50 - £129.75

3 0
3 years ago
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ANSWER IF YOU KNOW!!!!! THANKS
Ad libitum [116K]

Answer:

The third graph.

Step-by-step explanation:

The equations for the lines will be

P(x) = 2x-4

l(x) = -2x-4

When x = 0 both of these functions equal -4. The only graph where this happens is the third one.

You can check this by looking at the slopes and plugging in points.

6 0
3 years ago
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The diameter of a Frisbee is 12 in. What is the area of the Frisbee?
Alina [70]

we know that

Area of the circle is equal to

A=\pi r^{2}

where

r is the radius

in this problem

diameter=12\ in \\ radius=diameter/2\\ radius=12/2\\ radius=6\ in

A=3.14* 6^{2}

A=113.04 in^{2}

therefore

the answer is the option

d. 113.04 sq. in.

8 0
3 years ago
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PLEASE HELP!
Leona [35]

Answer:

The initial temperature of the object was 37.6

Step-by-step explanation:

we have

f(t)=Ce^{(-kt)} +20

where

f(t) represent the temperature of the object in degree Celsius

t is the time in minutes

Find the value of the constant C

we have the ordered pair (4,35)

substitute in the equation and solve for C

35=Ce^{(-0.0399*4)} +20\\Ce^{(-0.0399*4)}=15\\C=15/e^{(-0.0399*4)}\\C=17.6

Find the initial value of the object

we know that

The initial temperature is the value of f(t) when the value of t is equal to zero

so

For t=0

f(0)=(17.6)e^{(-k*0)} +20\\f(0)=17.6 +20\\f(0)=37.6

therefore

The initial temperature of the object was 37.6 (I not include units)

7 0
3 years ago
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