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3 years ago

What does -4.2-(-2.9)= equal

Mathematics

2 answers:

jok3333 [9.3K]3 years ago

8 0

Answer:

Step-by-step explanation:

$- 4 .2 - ( - 2.9) \\ = - 8 - ( - 18) \\ = - 8 + 18 \\ = 10$

Anettt [7]3 years ago

3 0

Answer: -1.3

Step-by-step explanation:

-4.2-(-2.9)

Looking at this equation

Minus × minus = plus

-4.2+2.9

= -1.3

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A line passes through the points(-9,-9) and (-6,-6)<br> Fine the slope of the line

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Answer:

Slope of the line = 1

Step-by-step explanation:

A line with two points, we are asked to find the slope

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At 82°F, a certain insect chirps at a rate of 61 times per minute, and at 91°F, they chirp 124 times per minute. Write an equati

Ganezh [65]

Answer:

$y=7x-513$

Step-by-step explanation:

Let

x----> the temperature in degrees Fahrenheit

y ---->insect chirping rate in times per minute

we have the ordered pairs

(82,61) and (91,124)

step 1

Find the slope

The formula to calculate the slope between two points is equal to

$m=\frac{y2-y1}{x2-x1}$

substitute the values

$m=\frac{124-61}{91-82}$

$m=\frac{63}{9}=7$

step 2

Find the equation of the line

we know that

The equation in slope intercept form is equal to

$y=mx+b$

where

m is the slope

b is the y-intercept

we have

$m=7$ ---> the units are chirps per minute/degree F

take the point (82,61)

substitute and solve for b

$61=7(82)+b$

$61=574+b$

$b=-513$

substitute

$y=7x-513$

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