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3 years ago

Help the two questions above please!

Mathematics

1 answer:

MArishka [77]3 years ago

5 0

the answer is d and d i think im not sure for the second one but 100% sure for first one

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What time is 7 1/2 before 2:12 am?

Charra [1.4K]

It would be 6:42 pm I believe.

4 0

3 years ago

Find the slope and the equation of the line tangent to f (x )equals StartFraction 2 x minus 1 Over x plus 7 EndFraction at x =

kondor19780726 [428]

Answer:

$y=\frac{5}{27} x-\frac{1}{27}$

Step-by-step explanation:

$f(x)=\frac{2x-1}{x+7}$

To find slope of f(x) at x=2, find the derivative f'(x)

apply quotient rule to find derivative

$f(x)=\frac{2x-1}{x+7}\\f'(x)=\frac{2(x+7)-1(2x-1)}{(x+7)^2} \\f'(x)=\frac{15}{(x+7)^2}$

f'(x) is the slope . Now find slope at x=2. plug in 2 for x

$f'(x)=\frac{15}{(x+7)^2}\\f'(2)=\frac{15}{(2+7)^2}=\frac{5}{27}$

find out f(x) when x=2

$f(x)=\frac{2x-1}{x+7}\\f(2)=\frac{2(2)-1}{2+7}=\frac{1}{3}$

Now frame the equation of the line

(2,1/3) slope = 5/27

$y-y_1=m(x-x_1)\\y-\frac{1}{3}=\frac{5}{27} (x-2)\\y-\frac{1}{3}=\frac{5}{27} x-\frac{10}{27}\\\\y=\frac{5}{27} x-\frac{1}{27}\\\\$

6 0

3 years ago

Work out the circumference of this circle <br> Give your answer in terms pi<br> Radius 6mm

Paladinen [302]

Answer:

$39.699cm$

Step-by-step explanation:

<h3>Definition(s):</h3>

1. <em>Circumference</em>

The outer boundary, especially of a circular area; <em>perimeter</em>.

2. <em>Radius</em>

A straight line extending from the center of a circle or sphere to the <em>circumference</em> or <em>surface</em>.

<h2>solution</h2>

The circumference of a circle can be obtained by using the equation below:

$C=2\pi r$

where the mathematical constant, $\pi$ , has a value of approximately 3.14 and

$r$ represents the radius of the circle.

All we have to do is multiply the given radius by two and multiply that value by $\pi$ to determine C:

$\text{Circumference} = 2\times6cm\times\pi$

$\text{Circumference}=12cm\times\pi$

$\text{Circumference}=37.699cm$

4 0

2 years ago

HELPPP!!

schepotkina [342]

Answer:

Step-by-step explanation:

Comment

A rational number is one that can be expressed as x/y. The first statement is false. All whole numbers are rational. They can always be expressed as x/1

Some rational numbers are not whole numbers. That's true. 4/7 is rational but not whole.

Some irrational numbers are not integers. I'm tempted to say this is true.

pi is irrational and it certainly is not an integer.

Answer

false

true

true.

7 0

2 years ago

Mulitply the binomials and identify the value of "B" in the product. (−2x + 3)(x + 8) = −2x2 −Bx + 24 {"version":"1.1","math":"M

RUDIKE [14]

For
(c+d)(ex+f)
the expanded form is
dex^2+dex+cfx+df
(ce)x^2+(de+cf)x+(df)
ax^2+bx+c
the value of a is ce
the value of b is de+cf
the value of c is df

so

(-2x+3)(x+8)
(-2x+3)(1x+8)
b is 3*1+-2*8=3-16=-13

answer is -13
so pick 13 because we have -B, so B=13

3 0

3 years ago