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3 years ago

13

Please help me is for my homework

2 answers:

MArishka [77]3 years ago

8 0

Answer:

it's 50% because it's half the circle

jek_recluse [69]3 years ago

7 0

Answer:

50%

Step-by-step explanation:

so 1 half is colored in so 1/2 is also 50%

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Use rounding to estimate the product. Is your estimate an underestimate or an overestimate? 8 × 9.82

kkurt [141]

Answer:

Over

Step-by-step explanation:

7 0

3 years ago

A 200-liter tank initially full of water develops a leak at the bottom. Given that 20% of the water leaks out in the first 5 min

Leya [2.2K]

Answer:

127.53 liters left after 10 minutes

Step-by-step explanation:

Let

$A \to Amount$

$t \to time$

Given

$A(0) = 200$ --- initial

$A(5) = 200 * (1 - 20\%) = 160$ --- the amount left, after 5 minutes

Required

$A(10)$ --- amount left after 5 minutes

To do this, we make use of:

$A(t) = A(0) * e^{kt}$

$A(5) = 160$ implies that:

$160 = 200 * e^{k*5}$

Divide both sides by 200

$0.80 = e^{k*5}$

Take natural logarithm of both sides

$\ln(0.80) = \ln(e^{k*5})$

$\ln(0.80) = \ln(e^{5k})$

$\ln(0.80) = 5k\ln(e)$

So, we have:

$-0.223 = 5k$

Divide by 5

$k = -0.045$

So, the function is:

$A(t) = A(0) * e^{kt}$

$A(t) = 200 * e^{-0.045t}$

The amount after 10 minutes is:

$A(10) = 200 * e^{-0.045*10}$

$A(10) = 200 * e^{-0.45}$

$A(10) = 127.53$

3 0

3 years ago

What is this equation 4(3+5)- 3.9*2<br> THIS ISN´T A DECIMAL ITS A MIDDLE DOT

vredina [299]

Answer:

The answer is letter 'J'

Step-by-step explanation:

4(3+5) - 3 x 9^2

4(8) - 3 x 9^2 ← 9 x 9 = 81

16 - 3 x 9^2

16 - 3 x 81

13 x 81

1,053

4 0

3 years ago

Solve for z.<br> 12 = 15 ( z - 1/5 )

bija089 [108]

Answer:

1=z

Step-by-step explanation:

Multiply 15 to the parenthesis.

12=15z-15/5

12=15z-3

Add 3 to both sides

15=15z

Simplify

1=z

5 0

3 years ago

Wor At an assembly, 180 students sit in 9 equal rows. How many student n each row?

aliina [53]

Answer: 20

Step-by-step explanation:

Divide the number of students by the number of rows,

180/9=20

3 0

3 years ago