Ask question

Ask question

All categories

4 years ago

15

In a town in Canada, the temperature was 20 °F at sunset. The temperature decreases by 2 every hour. How many hours does it take

for the temperature
to fall from 20 °F to -6 °F?
AO 3 hours
B.O 7 hours
C. 13 hours
D. 14 hours

1 answer:

Pavel [41]4 years ago

7 0

Answer:

C. 13

Step-by-step explanation:

You might be interested in

A certain recipe asks for 1/7 cup of granola. How much is needed to make 1/9 of a recipe?

Lunna [17]

9/28 of a cup :)
Pm me with any further questions

8 0

3 years ago

Jessica and Martha each have a bag of cookies with unequal quantities. They have 30 cookies total between the two of them. Each

Basile [38]

Answer:

Part 1) The inequality that describes the relationship between the number of cookies each one of them has is $x^{2} -30x+224\geq 0$

Part 2) Jessica has at least 2 cookies more than Martha

Step-by-step explanation:

Part 1) Find the inequality that describes the relationship between the number of cookies each one of them has

Let

x----> the number of cookies when Jessica started

30-x ----> the number of cookies when Martha started

we know that

Each of them ate 6 cookies from their bag

so

The cookies left in each bag are

(x-6) ----> Jessica

and (30-x-6)=(24-x) ---> Martha

The product is equal to (x-6)(24-x)

The product of the number of cookies left in each bag is not more than 80.

so

$(x-6)(24-x)\leq 80\\ \\24x-x^{2}-144+6x\leq 80\\ \\-x^{2} +30x-144-80\leq 0\\ \\-x^{2} +30x-224\leq 0$

Multiply by -1 both sides

$x^{2} -30x+224\geq 0$

Part 2) Solve the quadratic equation

$x^{2} -30x+224\geq 0$

Solve by graphing

The solution is x=16 cookies

so

(30-x)=30-16=14 cookies

therefore

The number of cookies when Jessica started was 16 cookies

The number of cookies when Martha started was 14 cookies

The number of cookies left in each bag is equal to

Jessica

16-6=10 cookies

Martha

14-6=8 cookies

Jessica has at least 2 cookies more than Martha

7 0

3 years ago

Read 2 more answers

Solve the inequality <br> e-2 <0

Lena [83]

Answer:

e < 2

Step-by-step explanation:

Given

e - 2 < 0 ( ad 2 to both sides )

e < 2

8 0

3 years ago

Jina received a $70 gift card for a coffee store. She used it in buying some coffee that cost $7.51 per pound. After buying the

dem82 [27]

Answer: 3 pounds

Step-by-step explanation:

The equation can be set up according to slope form: y=mx+b where x represents cost per round.

$70 = $7.51x + $47.47

Subtract 47.47 to both sides: $22.53 = $7.51x

Divide both sides by 7.51: 3 = x

4 0

3 years ago

Read 2 more answers

Theres a picture, im giving brainliest

Thepotemich [5.8K]

Answer:

A maybe?

Step-by-step explanation:

3 0

3 years ago