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3 years ago

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I need help with this question please, if anyone would be kind enough to give me the correct answer, in return I would gladly r

ate a 5 star and give brainliest (:

1 answer:

belka [17]3 years ago

5 0

-4(3n + 5) is the answer

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What is the value of x in the equation x – y = 30, when y = 15?

SVEN [57.7K]

<span>x – y = 30, when y = 15
x - 15 = 30
x = 30 + 15
x = 45

answer: </span><span>when y = 15, x = 45</span>

5 0

3 years ago

Read 2 more answers

Sam and Bobby want to know who cycled faster. The table shows the total miles Sam traveled over time. The graph shows the same r

tigry1 [53]

Answer:

<h2>Sam cycled fast, at a rate of 10 miles per hour.</h2>

Step-by-step explanation:

To solve this problem we have to find the slope of each case. The definition of a slope is:

$m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}\\$

Where $(x_{1};y_{1})$ is the first point, and $(x_{2};y_{2})$ is the second point.

Let's find each slope.

<h3>Sam.</h3>

Let's use the points $(2;20)$ and $(5;50)$

Applying the definition of the slope, we have:

$m_{sam} =\frac{50-20}{5-2}=\frac{30 \ miles}{3 \ hour}=10 \ miles/hour$

This relation means that Sam cycled 10 miles per hour.

<h3>Bobby.</h3>

Let's use the points $(2;18)$ and $(6;54)$

$m=\frac{54-18}{6-2}=\frac{36 \ miles}{4 \ hour}=9 \ miles/hour$

Bobby cycled 9 miles per hour.

Therefore, according to these ratios, Sam cycled fast, at a rate of 10 miles per hour.

7 0

3 years ago

Brianna wants to buy a digital camera for a photography class. One store offers the camera for $48 down and a payment plan of $2

tatyana61 [14]

Answer:

the second store

Step-by-step explain: the second store is 244 but the first store is 300..i hope this helps. 14*12+76=244 and 21*12 + 48 is 300

7 0

3 years ago

HELP FAST !!! WILL GIVE BRAINLIEST!!

Solnce55 [7]

Answer:

56 degrees

Step-by-step explanation:

Coz they're corresponding angles

3 0

3 years ago

The radioactive element americium-241 has a half-life of 432 years. How many years will it take a 10 gram mass of americium-241

geniusboy [140]

<h2>Answer: 816 years</h2>

This problem can be solved using the <u>Radioactive Half Life Formula: </u>

<u />

$A=A_{o}.2^{\frac{-t}{h}}$ (1)

Where:

$A=2.7g$ is the final amount of the material

$A_{o}=10g$ is the initial amount of the material

$t$ is the time elapsed (the quantity we are asked to find)

$h=432y$ is the half life of americium-241

Knowing this, let's find $t$ from (1):

$2.7g=(10g).2^{\frac{-t}{432y}}$

$\frac{2.7g}{10g}=2^{\frac{-t}{432y}}$

$0.27g=2^{\frac{-t}{432y}}$

Applying natural logarithm in both sides:

$ln(0.27g)=ln(2^{\frac{-t}{432y}})$

$-1.309=-\frac{t}{432y}ln(2)$

$-t=\frac{(-1.309)(432y)}{0.693}$

<u></u>

<u>Finally:</u>

$t=816y$

3 0

3 years ago