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2 years ago

Please I need help on this

Mathematics

2 answers:

Damm [24]2 years ago

4 0

Answer:

9k - 18 = -6

Step-by-step explanation:

You have to distribute(jump over the fence)

you need to multiply 9 × k, which will equal 9k

then you will multiply 9×-2, which will equal -18. the 18 stays negative because when multiplying a (+) and a (-) your answer will always be a negative. That's how I got the answer!

Sonja [21]2 years ago

3 0

The first one is 9k cause you’re multiplying it and the second one is -18 because you’re multiplying -2 and 9

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Question 1(Multiple Choice Worth 1 points)

Stolb23 [73]

so, they already used 4,885.78 this month, but whatever all five family members can use total for a month is 7,250.50, so since they already used 4,885.78, they have left 7,250.50 - 4,885.78 = 2364.72.

$\bf \begin{array}{lllllll} \textit{amount all five}&&\textit{amount they}&\textit{must be}&\textit{amount allowed}\\ \textit{members can use}&&\textit{already used}&\textit{equals or less}&\textit{per month}\\\\ 5x&+&4,885.78&\leqslant&7,250.50 \end{array}$

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4 years ago

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NASA launches a rocket at t=0 seconds. Its height, in meters above sea-level, as a function of time is given by h(t)=−4.9t2+121t

Alenkasestr [34]

NASA launches a rocket at t = 0 seconds. Its height, in meters above sea-level, as a function of time is given by

$h(t)=-4.9t^2+121t+283$

The sea level is represented by h = 0, therefore, to find the corresponding time when h splashes into the ocean we have to solve for t the following equation:

$h(t)=0\implies-4.9t^2+121t+283=0$

Using the quadratic formula, the solution for our problem is

$\begin{gathered} t=\frac{-(121)\pm\sqrt{(121)^2-4(-4.9)(283)}}{2(-4.9)} \\ =\frac{121\pm142.083778...}{9.8} \\ =\frac{121+142.083778...}{9.8} \\ =26.8452834694... \end{gathered}$

The rocket splashes after 26.845 seconds.

The maximum of this function happens at the root of the derivative. Differentiating our function, we have

$h^{\prime}(t)=-9.8t+121$

The root is

$-9.8t+121=0\implies t=\frac{121}{9.8}=12.347$

Then, the maximum height is

$h(12.347)=1029.99$

1029.99 meters above sea level.

6 0

1 year ago

Write the number which is a third of the way from -2 to -7?

artcher [175]

Answer: -5

Step-by-step explanation: -3 , -4 , -5 is the third

5 0

3 years ago

Simplify and Show Work or no brainlist

natali 33 [55]

Answer:

Step-by-step explanation:

and also you are diviing the numbers then subtracting 9

5 0

3 years ago

Read 2 more answers

Perform the indicated operation.<br> 1 1/6 + 7 3/6 =<br><br> I HAVE 5 MINUTES!!!

gizmo_the_mogwai [7]

Answer:

1 1/6 - 7 3/6 = -19/

= -6 1/

≅ -6.3333333

Step-by-step explanation:

Conversion a mixed number 1 1/

to a improper fraction: 1 1/6 = 1 1/

= 1 · 6 + 1/

= 6 + 1/

= 7/

To find new numerator:

a) Multiply the whole number 1 by the denominator 6. Whole number 1 equally 1 * 6/

= 6/

b) Add the answer from previous step 6 to the numerator 1. New numerator is 6 + 1 = 7

c) Write a previous answer (new numerator 7) over the denominator 6.

One and one sixth is seven sixths

Conversion a mixed number 7 3/

to a improper fraction: 7 3/6 = 7 3/

= 7 · 6 + 3/

= 42 + 3/

= 45/

To find new numerator:

a) Multiply the whole number 7 by the denominator 6. Whole number 7 equally 7 * 6/

= 42/

b) Add the answer from previous step 42 to the numerator 3. New numerator is 42 + 3 = 45

c) Write a previous answer (new numerator 45) over the denominator 6.

Seven and three sixths is forty-five sixths

Subtract: 7/

- 45/

= 7 - 45/

= -38/

= 2 · -19/

2 · 3

= -19/

For adding, subtracting, and comparing fractions, it is suitable to adjust both fractions to a common (equal, identical) denominator. The common denominator you can calculate as the least common multiple of both denominators - LCM(6, 6) = 6. In practice, it is enough to find the common denominator (not necessarily the lowest) by multiplying the denominators: 6 × 6 = 36. In the next intermediate step, the fraction result cannot be further simplified by canceling.

In words - seven sixths minus forty-five sixths = minus nineteen thirds.

4 0

3 years ago