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3 years ago

11 Which expression is equivalent to x2 - 17x - 60?

Mathematics

2 answers:

PSYCHO15rus [73]3 years ago

8 0

The answer is (x-20)(x+3)

(x-20)(x+3)
= x^2 + 3x - 20x -60
= x^2 - 17x - 60

GalinKa [24]3 years ago

6 0

Answer:60 using ac method

Step-by-step explanation:

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PLEASE HELP! YOU WILL GET 10 BRAINLIST!! PLEASE SHOW ALL OF YOUR WORK/HOW YOU GOT THE ANSWER

valentina_108 [34]

Answer:

-2(y+4)-2y >8

-2y-8-2y>8

-4y-8>8

-4y<8+8

When you move a number on the other side it changes the side then > will become <

-4y<16

-4y/-4<16/-4

y<-4

5 0

3 years ago

Scientist can determine the age of ancient objects by a method called radiocarbon dating. The bombardment of the upper atmospher

Artemon [7]

Answer: 2500 years

Step-by-step explanation:

I'm not quite sure if I'm doing this right myself but I'll give it a shot.

We use this formula to find half-life but we can just plug in the numbers we know to find t.

$A(t)=A_{0}(1/2)^t^/^h$

We know half-life is 5730 years and that the parchment has retained 74% of its Carbon-14. For $A_{0$ let's just assume that there are 100 original atoms of Carbon-14 and for A(t) let's assume there are 74 Carbon-14 atoms AFTER the amount of time has passed. That way, 74% of the C-14 still remains as 74/100 is 74%. Not quite sure how to explain it but I hope you get it. h is the last variable we need to know and it's just the half-life, which has been given to us already, 5730 years, so now we have this.

$74=100(1/2)^t^/^5^7^3^0$

Now, solve. First, divide by 100.

$0.74=(0.5)^t^/^5^7^3^0$

Take the log of everything

$log(0.74)=\frac{t}{5730} log(0.5)$

Divide the entire equation by log (0.5) and multiply the entire equation by 5730 to isolate the t and get

$5730\frac{log(0.74)}{log(0.5)} =t$

Use your calculator to solve that giant mess for t and you'll get that t is roughly 2489.128182 years. Round that to the nearest hundred years, and you'll find the hopefully correct answer is 2500 years.

Really hope that all the equations that I wrote came out good and that that's right, this is definitely the longest answer I've ever written.

5 0

3 years ago

In chemistry class, Bob recorded the volume of a liquid as 13.2 mL. The actual volume was 13.7 mL. Use the formula to find perce

frez [133]

Experimental value=13.2mL
actual volume=13.7mL

|13.2-13.7|=|-0.5|=0.5
0.5/13.7 *100%=3.7%

6 0

3 years ago

Read 2 more answers

4. Find the value of the expression below for r=4 and t=2.

Katen [24]

Answer: