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3 years ago

6

After a power failure, the temperature in a freezer increased at an average rate of 2.5 °F per hour. The total increase was 7.5

°F. Write and solve an equation to find the number of hours until the power was restored.

1 answer:

makvit [3.9K]3 years ago

6 0

YOU CAN WRITE AN EQUATION OF 7.5 Divide 2.5 = any letter

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I need help !!30 PTS!!<br>Pls DO help on ALL 3 on the screenshot

GenaCL600 [577]

1. (16,25)-(24,5) the interval it falls from is 25 mph to 5 mph or it decreased by 20 mph.

2. From D (24,5) to E (28,45). The interval of time from point D to point E is 5 mph to 45 mph. or it increased by 40 mph.

3. From B (6,25) to C (16,25) and the constant rate is 25 MPH.

I'm not 100% sure about the everything.

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3 years ago

Help me plz I don’t understand

puteri [66]

Emma’s statement makes sense and Charles’ doesn’t, bcuz when you say 0.75 it should be 75 tenths, because it’s less than a whole number, but charles said 7 and 5 tenths, if it’s 7 and 5 tenths, it would be 7.5.

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2 years ago

For each of the following functions, determine if they are injective. Also determine if theyare surjective. Also determine if th

timurjin [86]

Answer:

Check below

Step-by-step explanation:

1. Definition for intervals

$(a,b)=\left \{ x\in\Re : a$

2. Functions

1) $\Re \rightarrow \Re \\ f(x)=x$

Let's perform graph tests.

That's an one to one, injective function. Look how any horizontal line touches that only once. Also, It's a surjective and a bijective one.

2) $\Re\geq0\rightarrow\Re , f(x)=x+1\\$

Injective, surjective and bijective.

Injective: a horizontal line crosses the graph in one point.

3) $f:\Re\geq 0\rightarrow\Re, f(x) = cos(x)$

The cosine function is not injective, bijective nor surjective.

4) $f:\Re\rightarrow\Re \:f(x)=ex$

Since e, is euler number it's a constant. It's also injective, surjective and bijective.

5) Quite unclear format

$6) \:f:\Re\rightarrow(0,\infty), f(x) =ex$

Despite the Restriction for the CoDomain, the function remains injective, surjective and therefore bijective.

$7) f:\Re\geq 0 \rightarrow \Re\geq0, f(x) =x^{4}$

Not injective nor surjective therefore not bijective too.

$8).f:\{-1,2,-3\}}\rightarrow \{1,4,9\}, f(x) =x^{2}$

$f(-1)=1, f(2)=4, f(-3)=9$

Injective (one to one), Surjective, and Bijective.

$10) f:\Re\geq 0\rightarrow [-1,1], f(x)= cos(x)\\-1=cos(x) \therefore x=\pi,3\pi,5\pi,etc.$

Surjective.

$11.f:R\geq 0[-1,1], f(x) = 0\\$

Surjective

12.f: US Citizens→Z, f(x) = the SSN of x.

General function

13.f: US Zip Codes→US States, f(x) = The state that x belongs to.

Surjective

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3 years ago

Find the measure of angle 7<br> A. 65<br> B. 35<br> C.80

Gekata [30.6K]

Answer:

I'll just do the entire thing since it's 13 points

<em>1.</em> 35

<em>2. </em>45

<em>3. </em>45

<em>4. </em>65

<em>5. </em>115

<em>6. </em>65

<em>7. </em>80

<em>8. </em>35

<em>9. </em>145

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If two triangles are congruent then the six a0 parts are congruent

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If two triangles are congruent the corresponding angles and sides are congruent.
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3 years ago

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