Hiii please help i’ll give brainliest if you give a correct answer tysm!

John was swimming for hour anda half hours at a speed of 2 miles per hour.How far did he swim?

Marrrta [24]

Answer:

3 miles

Step-by-step explanation:

2+1=3 znnsndndnndjd

5 0

3 years ago

Read 2 more answers

Evaluate the expression 2ab 3+ 6a 3 - 4ab2 when a=2 and b=4. a.176 b.180 c.215 d.216

Tom [10]

The first step for solving this expression is to insert what a and b stand for into the expression. This will change the expression to the following:
2(2)(4)³ + 6(2)³ - 4(2)(4)²
Now we can start solving this by factoring the expression
2(2 × 4³ + 3 × 2³ - 4 × 4²)
Write 4³ in exponential form with a base of 2.
2(2 × $2^{6}$ + 3 × 2³ - 4 × 4²)
Calculate the product of -4 × 4².
2(2 × $2^{6}$ + 3 × 2³ -4³)
Now write 4³ in exponential form with a base of 2.
2(2 × $2^{6}$ + 3 × 2³ - $2^{6}$ )
Collect the like terms with a base of 2.
2( $2^{6}$ + 3 × 2³)
Evaluate the power of 2³.
2( $2^{6}$ + 3 × 8)
Evaluate the power of $2^{6}$ .
2(64 + 3 × 8)
Multiply the numbers.
2(64 + 24)
Add the numbers in the parenthesis.
2 × 88
Multiply the numbers together to find your final answer.
176
This means that the correct answer to your question is option A.
Let me know if you have any further questions.
:)

5 0

3 years ago

Sophia has an ear infection. The doctor prescribes a course of antibiotics. Sophia is told to take 500 mg doses of the antibioti

ser-zykov [4K]

Answer:

Step-by-step explanation:

Part 1:

Let

Q₁ = Amount of the drug in the body after the first dose.

Q₂ = 250 mg

As we know that after 12 hours about 4% of the drug is still present in the body.

For Q₂,

we get:

Q₂ = 4% of Q₁ + 250

= (0.04 × 250) + 250

= 10 + 250

= 260 mg

Therefore, after the second dose, 260 mg of the drug is present in the body.

Now, for Q₃ :

We get;

Q₃ = 4% of Q2 + 250

= 0.04 × 260 + 250

= 10.4 + 250

= 260.4

For Q₄,

We get;

Q₄ = 4% of Q₃ + 250

= 0.04 × 260.4 + 250

= 10.416 + 250

= 260.416

Part 2:

To find out how large that amount is, we have to find Q₄₀.

Using the similar pattern

for Q₄₀,

We get;

Q₄₀ = 250 + 250 × (0.04)¹ + 250 × (0.04)² + 250 × (0.04)³⁹

Taking 250 as common;

Q₄₀ = 250 (1 + 0.04 + 0.042 + ⋯ + 0.0439)

= 2501 − 0.04401 − 0.04

Q₄₀ = 260.4167

Hence, The greatest amount of antibiotics in Susan’s body is 260.4167 mg.

Part 3:

From the previous 2 components of the matter, we all know that the best quantity of the antibiotic in Susan's body is regarding 260.4167 mg and it'll occur right once she has taken the last dose. However, we have a tendency to see that already once the fourth dose she had 260.416 mg of the drug in her system, that is simply insignificantly smaller. thus we will say that beginning on the second day of treatment, double every day there'll be regarding 260.416 mg of the antibiotic in her body. Over the course of the subsequent twelve hours {the quantity|the quantity|the number} of the drug can decrease to 4% of the most amount, that is 10.4166 mg. Then the cycle can repeat.

3 0

3 years ago

Use the coordinates of the labeled point to find a point-slope equation of the line

disa [49]

Answer:

B. y + 2 = -2(x - 4)

Step-by-step explanation:

First, find the slope (m) of the line using two points in the line, (3, 0) and (4, -2):

$slope (m) = \frac{y_2 - y_1}{x_2 - x_1} = \frac{-2 - 0}{4 - 3} = \frac{-2}{1} = -2$

Slope (m) = -2.

Next, substitute (a, b) = (4, -2) and m = -2 into y - b = m(x - a)

Thus:

y - (-2) = -2(x - 4)

y + 2 = -2(x - 4)

8 0

3 years ago

Which of the following best describes the set of complex numbers?

erica [24]

Answer:

C

Step-by-step explanation:

4 0

2 years ago