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trapecia [35]
3 years ago
14

A diagram of a pizza is shown.

Mathematics
1 answer:
mash [69]3 years ago
4 0

Answer:

A. 30 cm

Step-by-step explanation:

The surface area of a 14-inch pizza is 3.14 x 49 (7 x 7 = 49) = 153.86 square inches of surface area

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A tank contains 120 liters of fluid in which 50 grams of salt is dissolved. Brine containing 1 gram of salt per liter is then pu
gtnhenbr [62]

If A(t) is the amount of salt in the tank at time t, then A(0) = 50 g and

A'(t) = (1 g/L)*(3 L/min) - (A(t)/120 g/L)*(3 L/min)

\implies A'+\dfrac A{40}=3

Multiply both sides by e^{t/40}, so that the left side can be condensed as the derivative of a product:

e^{t/40}A'+\dfrac{e^{t/40}}{40}A=3e^{t/40}

\left(e^{t/40}A\right)'=3e^{t/40}

Integrate both sides and solve for A(t).

e^{t/40}A=120e^{t/40}+C

\implies A(t)=120+Ce^{-t/40}

Given that A(0) = 50 g, we have

50=120+C\implies C=-70

so that the amount of salt in the tank at time t is

\boxed{A(t)=120-70e^{-t/40}}

7 0
3 years ago
Consider the sequence: 8, 11, 14, 17, 20, 23, 26, ... Write a recursive definition.
Amiraneli [1.4K]

The first term is 8, so a_{1} = 8

Each time we want a new term, we add on 3

8+3 = 11

11+3 = 14

14+3 = 17

17+3 = 20

23+3 = 26

and so on

This recursive step of adding on 3 to the prior term is written as this: a_{n} = 3 + a_{n-1} which says "to get the nth term, add 3 to the term just before the nth term"

Based on what you posted for your answer choices, the final answer is likely choice C. However it seems some weird typo happened.

8 0
3 years ago
Anyone want points and a Brainliest :p
fenix001 [56]

Answer:

MEEEE PLEASEEEEEEEE

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
Round your answer to the nearest hundredth.<br><br> PLEASE HELP ME
g100num [7]
I think you have to multiply
6 0
3 years ago
Pls help, will mark brainliest
SashulF [63]

Step-by-step explanation:

\frac{\pi}{2}  = 90

its 1/4 of the circle

circle circumference:

8 \times \pi

we need 1/4 of it, so its

2 \times \pi = 6.28

5 0
2 years ago
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