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3 years ago

Lowkey bout to fail so help me out-

Mathematics

2 answers:

inysia [295]3 years ago

5 0

Answer:

660 in squared

Step-by-step explanation:

30+36=66

66/2=33

33*20=660

Rashid [163]3 years ago

4 0

Step-by-step explanation:

Area of trapezium=(b1+b2)*h/2 ( as given in figure)

b1=30in.

b2=36in.

h=20in.

Area=(30+36)*20/2

=660inches²

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For what point on the curve of y=8x^2 - 3x is the slope of a tangent line equal to -67

AleksandrR [38]

The point on the curve is (–4, 140)

Solution:

Given $y=8x^2-3x$ and slope is –67.

slope = –67

$\frac{dy}{dx}=-67$ – – – – (1)

Now calculate $\frac{dy}{dx}$ for the given curve $y=8x^2-3x$ .

Using differential rule:

$$\frac{d}{dx}(x^n)=nx^{n-1}$

$$\frac{dy}{dx}=\frac{d}{dx}(8x^2-3x)$

$$=\frac{d}{dx}(8x^2)-\frac{d}{dx}(3x)$

$$=(8\times2x^{2-1})-(3\times1x^{1-1})$

$$=16x^1-3x^0$

$$=16x-3$

$$\frac{dy}{dx}=16x-3$ – – – – (2)

Equate (1) and (2).

$16x-3=-67$

$16x=-67+3$

$16x=-64$

⇒ x = –4

Substitute x = –4 in y.

⇒ $y=8(-4)^2-3(-4)$

⇒ $=8(16)+12$

⇒ y = 140

Hence, the point on the curve given is (–4, 140).

3 0

4 years ago

Caroline bought 20 shares of stock at 10 1/2, and after 10 months the value of the stocks was 11 1/4. If Caroline were to sell a

joja [24]

A, because: 20x10 1/2=210

And 20x11 1/4=225

And 225-210=15

So thats the answer.

8 0

4 years ago

Read 2 more answers

*<br> Write the phrase and expression: 7 less than a number w<br><br> I’m so lost please help me

mr_godi [17]

Answer:

expression: w - 7

phrase: 7 less than a number

Step-by-step explanation:

3 0

3 years ago

Write an integer that represents this scenario:

ryzh [129]

Answer:

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Step-by-step explanation:

if johnny is swmming 1 meter below then its -1 C

7 0

3 years ago

Which line has the same slope as the lone passing through (-4,-1) and (-1,-7)

Julli [10]

Answer:

1) 6x+3y=5

Step-by-step explanation:

1) First, find the slope of the line passing through (-4, -1) and (-1, -7). Use the slope formula $m = \frac{y_2-y_1}{x_2-x_1}$ . Substitute the x and y values of the two points into the formula and solve:

$m = \frac{(-7)-(-1)}{(-1)-(-4)} \\m = \frac{-7+1}{-1+4} \\m = \frac{-6}{3} \\m = -2$

So, the slope is -2.

2) Now, identify the slopes of the lines in the options. We already know the slope of $y = -\frac{1}{2} x-7$ is $-\frac{1}{2}$ since it is in slope-intercept form. y = -2 must have a slope of 0 since it's horizontal, and all equations with the format of y = a number are horizontal.

To find the slope of $6x + 3y = 5$ , isolate y to put the equations into slope-intercept form ( $y = mx + b$ format), and whatever the coefficient of the x-term is will be the slope.

$6x + 3y = 5\\3y = -6x+5\\y = -2x + \frac{5}{3}$ .

So, the slope of the first option is -2. It matches the slope we calculated in the first step, so that must be the answer.

4 0

3 years ago