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3 years ago

Hi do you want which is greater 0.75 x 81 or 0.9 x 81.

Mathematics

2 answers:

Burka [1]3 years ago

6 0

0.9 x 81 = 72.9
0.75x81 = 60.75
So 0.9 x 81 is greater than the other

anygoal [31]3 years ago

5 0

Answer:

0.9 x 81

Step-by-step explanation:

0.9 is actually 0.90 and 90 is greater than 75

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14 pencils every 4/9 of an hour. How many pencils used in an hour.

Aleks [24]

31.5 pencils used in 1 hour

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3 years ago

Are AB and CD parallel, perpendicular, or neither?* 1. A(-4, 8), B(4, 10), C(1, 1), D(-2, 13)

ohaa [14]

Answer:

Perpendicular

Step-by-step explanation:

Given

$A = (-4, 8)$

$B = (4, 10)$

$C = (1, 1)$

$D = (-2, 13)$

Required

Is AB and CD parallel?

First, we need to calculate the slope (m) of AB and CD

$m = \frac{y_2 - y_1}{x_2 - x_1}$

For AB:

$A (x_1,y_1)= (-4, 8)$

$B(x_2,y_2) = (4, 10)$

So:

$m = \frac{y_2 - y_1}{x_2 - x_1}$

$m = \frac{10 - 8}{4 - (-4)}$

$m = \frac{10 - 8}{4 +4}$

$m = \frac{2}{8}$

$m = \frac{1}{4}$

For CD:

$C(x_1,y_1) = (1, 1)$

$D(x_2,y_2) = (-2, 13)$

So:

$m = \frac{y_2 - y_1}{x_2 - x_1}$

$m = \frac{13 - 1}{-2 - 1}$

$m = \frac{12}{-3}$

$m = -4$

For Lines to be parallel, the slope must be equal:

i.e. $m_1 = m_2$

This condition is not true because:

$\frac{1}{4} \neq -4$

For Lines to be perpendicular, the slope must be:

$m_1 = -\frac{1}{m_2}$

This implies:

$\frac{1}{4} = -\frac{1}{-4}$

$\frac{1}{4} = \frac{-1}{-4}$

$\frac{1}{4} = \frac{1}{4}$

Hence, the lines are perpendicular

6 0

3 years ago

Which mapping diagram does NOT represent a function from x → y?

alexandr402 [8]

Answer:

Step-by-step explanation:

The answer is D because for it to be a function x-value can only have one output. For D, 8 has two outputs 1 and 4.

5 0

3 years ago

Read 2 more answers

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Korolek [52]

Positive parabola that has a minimum.

It’s positive if it opens upward, negative if it opens downward. It has a minimum if it opens upward, and maximum when it opens downward.

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3 years ago

ANSWER ASAP Write an equation of a line that passes through the points (2,3) and (2,-6).

Agata [3.3K]

1st you need to fine the slope using

S = y2-y1/x2-x1

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S = Undefined

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6 0

3 years ago