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3 years ago

Help me out here, I'll give brainlist for explanation.

Mathematics

1 answer:

LenaWriter [7]3 years ago

5 0

Answer:

See below.

Step-by-step explanation:

This is focusing on the order of operations.

PEMDAS = Parenthesis, exponents, multiplication, division, addition, subtraction.

40 ÷ [(18 - 9) - (13 - 12)]

40 ÷ [9 - 1]

40 ÷ 8

[(13 - 9) · 3] + [(14 - 8) · 2]

[4 · 3] + [6 · 2]

12 + 12

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Janet and her brother John went out to eat. Both paid the same amount. Janet got three burgers and left a $10 tip. John bought 4

lianna [129]

Answer:

Cost for 1 burger = 5 $

Amount spent by Janet = 25$

Amount spent by John = 25$

Explanation:

Let the cost for burger be p.

Janet got three burgers and left a $10 tip

Amount spent by Janet = 3 p + 10

John bought 4 burgers, but only left a $5 tip

Amount spent by John = 4 p + 5

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So, we have 3 p + 10 = 4 p + 5

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3 years ago

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Answer:

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3 years ago

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Answer:

E)82

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Write and equati9n of a l8ne that passes through (1,-2) and is perpendicular to -4x+7y=21

yarga [219]

Given:

A line passes through (1,-2) and is perpendicular to $-4x+7y=21$ .

To find:

The equation of that line.

Solution:

We have, equation of perpendicular line.

$-4x+7y=21$

Slope of this line is

$m_1=-\dfrac{\text{Coefficient of x}}{\text{Coefficient of y}}$

$m_1=-\dfrac{-4}{7}$

$m_1=\dfrac{4}{7}$

Product of slope of two perpendicular lines is -1.

$m_1\times m_2=-1$

$\dfrac{4}{7}\times m_2=-1$

$m_2=-\dfrac{7}{4}$

Now, slope of required line is $-\dfrac{7}{4}$ and it passes through (1,-2). So, the equation of line is

$y-y_1=m(x-x_1)$

where, m is slope.

$y-(-2)=-\dfrac{7}{4}(x-1)$

$4(y+2)=-7(x-1)$

$4y+8=-7x+7$

$4y+7x=7-8$

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Therefore, the equation of required line is $7x+4y=-1$ .

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2 years ago