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2 years ago

I need help with questions 2-5

Mathematics

1 answer:

Daniel [21]2 years ago

4 0

Answer: X^2-x-1=y

Step-by-step explanation:

Multiply every number inside the parentheses

(X+3)(x-4)

X^2-4x+3x-1

Add all similar numbers and we get

X^2-X-1

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Cone radius of 15 mm and a volume of 5890.5 mm3.What is the height of this cone?Show work.PLSSS help...

LekaFEV [45]

Answer: h = 25.0000585 mm

I can't really show work on a computer because there are symbols involved

Step-by-step explanation:

8 0

2 years ago

What is the slope?

V125BC [204]

Answer:

$2$

Step-by-step explanation:

For this I would find two friendly points like (60,10) and (70,30). Now we will plug in for the slope-intercept formula $m=\frac{y_2-y_1}{x_2-x_1}$ .

So...

$y_2=30\\y_1=10\\x_2=70\\x_1=60$

Now we plug in and solve...

$m=\frac{y_2-y_1}{x_2-x_1}\\m=\frac{30-10}{70-60}\\m=\frac{20}{10}\\m=\frac{2}{1}=2$

So the slope will be 2.

6 0

2 years ago

Why is -a² is always negative (a ≠ 0) and why is (-a)² is always positive?

hjlf

$-a^2=(-1)\cdot a\cdot a$

Regardless of the sign of $a$ , we have $a\cdot a=a^2\ge0$ (never negative). But multiplying by -1 makes it negative.

On the other hand,

$(-a)^2=((-1)\cdot a)^2=(-1)^2\cdot a^2=1\cdot a^2=a^2$

which can never be negative for real $a$ .

6 0

2 years ago

Miranda has 5/8 of a yard of ribbon. if she used 1/3 of it to make a hair bow, how much ribbon would she have left. PLEASE HELP

bezimeni [28]

Answer: 5/12

Step-by-step explanation:

Step 1

Whenever you have something OF something, you just mulltiply.

1/3 of 5/8=

1/3x5/8

5/24

She used 5/24, and started with 5/8