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3 years ago

Two math questions

Mathematics

1 answer:

Maurinko [17]3 years ago

3 0

Question is not clear

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The Ratio of the length of Sam's rope is to that of his friend Ryan's rope is 2 : 7. If Ryan's rope is 42 inches long, how long

sergejj [24]

Step-by-step explanation:

Sam's rope = 42 inches * (2/7) = 12 inches.

7 0

3 years ago

Find f(-7) if f(x) = 2x + 8.<br>A. -6 B. 2 C. 3 D. 22

spayn [35]

To find f(-7), just plug -7 in for all x

2(-7) + 8
-14 + 8
-6 is the answer!

7 0

4 years ago

Hi i need help asap my parent taught me how to do this equation (x^2-4x)^2+7x^2-28x+12=0 but i still dont understand I really ne

artcher [175]

Answer:

x = 1, x = 2, x = 3

Step-by-step explanation:

Hello, please consider the following.

$(x^2-4x)^2+7x^2-28x+12=0 \\\\(x(x-4))^2+7x(x-4)+12=0\\\\\text{Let's note }X = x(x-4)\text{ the equation becomes}\\\\X^2+7X+12=0\\\\\text{The sum of the zeroes is -7=-3+(-4) and the product is 12=(-4)*(-3).}\\\\\text{Wo we can factorise.}\\\\X^2+7X+12=X^2+4X+3X+12=X(X+4)+3(X+4)=(X+4)(X+3)=0\\\\X=-4 \ \ or \ \ X=-3$

So we need to solve:

$x(x-4)=-4 \ \ or \ \ x(x-4)=-3\\\\ x^2-4x-4=(x-2)^2=0 \ \ or \ \ x^2-4x+3=(x-1)(x-3)=0$

So, the solutions are x = 2, x = 1, x = 3

Thank you

6 0

3 years ago

Help me with this math problem

jek_recluse [69]

Answer:

15.49

Step-by-step explanation:

visually picture the diagram, the adjacent side of triangle will be equals to 7.6ft, the height will be 13.5, we use Pythagorean theorem, 7.6^2 + 13.5^2 = x^2

solve, for x by square rooting x which will give 15.49

4 0

4 years ago

Read 2 more answers

Some native american tribe made jewelry with dentalia shells.each denalia shell is 2 inches long how much longer would a necklac

solong [7]

Answer: 10 inches

Step-by-step explanation:

We know that each single Denalia shell is 2 inches. So let's calculate how many inches a 25 shell necklace would be

25(number of shells)×2(inches per 1 shell) = 50in

Next let's find the second necklace with 20 shells

20(number of shells) × 2(inches per 1 shell) = 40in

Finally we take the difference between the two

50in - 40in = 10 inches

Thus, the difference between a 25 shell necklace and a 20 shell necklace is 10 inches.

7 0

4 years ago