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3 years ago

I needd help is due today at 3pm qnq!!

Mathematics

1 answer:

masha68 [24]3 years ago

3 0

The answer is c, since they both add up to 90°

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Find f(-7) if f(x) = 2x 8.

aliina [53]

F(-7) = 2x + 8, f(-7) = 2(-7) + 8, f(-7) = -14 + 8, f(-7) = -6 Hope this helps you out, I didn't know if there was a plus sign between 2x and 8 but hope this helps you out!

6 0

3 years ago

Read 2 more answers

The half-life of a radioactive substance is the time it takes for a quantity of the substance to decay to half of the initial am

posledela

Step-by-step walkthrough:

Well a standard half-life equation looks like this.

$N = N_0 * (\frac{1}{2})^{t/p$

$N_0$ is the starting amount of parent element.

$N$ is the end amount of parent element

$t$ is the time elapsed

$p$ is a half-life decay period

We know that the starting amount is 74g, and the period for a half-life is 2.8 days.

Therefore you can create a function based off of the original equation, just sub in the values you already know.

$N(t) = 74g * (\frac{1}{2})^{t/2.8days$

This is easy now that we have already made the function. Here we just reuse it, but plug in 2.8 days.

$N(t) = 74g * (\frac{1}{2})^{t/2.8days} = N(2.8days) = 74g * (\frac{1}{2})^{2.8days/2.8days}\\= 74g * \frac{1}{2} = 37g$

Now we just gotta do some algebra. Use the original function but this time, replace $N(t)$ with 10g and solve algebraically.

$10g = 74g * (\frac{1}{2})^{t/2.8days}\\\\\frac{10g}{74g} = (\frac{1}{2})^{t/2.8days}$

Take the log of both sides.

$log(\frac{5}{37}) = log((\frac{1}{2})^{t/2.8days})$

Use the exponent rule for log laws that, $log(b^x) = x*log(b)$

$log(\frac{5}{37}) = \frac{t}{2.8days} * log(\frac{1}{2})$

$\frac{log(\frac{5}{37})}{log(\frac{1}{2})} = \frac{t}{2.8days}$

$2.8 * \frac{log(\frac{5}{37})}{log(\frac{1}{2})} = t$

slap that in your calculator and you get

$t = 8.1 days$

7 0

1 year ago

Bernie had $30 in his bank account. Today, he withdrew d dollars but tomorrow he will

IgorC [24]

Answer:

Step-by-step explanation:

Bernie had $30 in his bank account.

Today he withdrew $d

Now he has = $30 — $d

Because from $30 he took away $d that’s why $d have to subtract from the $30.

Tomorrow he’ll deposit $15 and that will be added up with current balance $30 —$d.

So, the expression to represent how much money Bernie will have in his bank account is $30 —$d + 15

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2 years ago

Activity 3

skad [1K]

Answer:

19 Lollipops per friend

Step-by-step explanation:

$60-3=57\\\\57/3=19$

3 0

2 years ago

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Car A is currently traveling 8 miles per hour slower than Car B. If Car A is currently traveling at a speed of 58 mile per hour,

garri49 [273]

58 + 8 = 66 miles per hour

3 0

3 years ago