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andreev551 [17]

2 years ago

12

At 1:00am the temperature was 87 degrees. A cold front came through and at 7:00pm the temperature was 45 degrees. What is the ra

te of change in the temperature in degrees per hour.

1 answer:

Dima020 [189]2 years ago

3 0

Answer:

7/hr

Step-by-step explanation:

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Solve the system of equations using substitution:<br><br> 7y+2x=16 <br> 5y-9=x

7nadin3 [17]

7y+2(5y-9)=16
7y+10y-18=16
17y=34
y=2

5(2)-9=x
10-9=x
x=1

5 0

2 years ago

Plz help and if u don't know then don't answer

Anon25 [30]

We see a right triangle here.
Use the Pythagorean Theorem:
a^2+b^2=c^2
a & b=legs
c=hypotenuse
a^2+15^2=20^2
a^2+225=400
a^2=175
a=13.2287565553
a=13.2
The missing side is 13.2cm

3 0

2 years ago

- Cindy spent $6 on her meal. She spent $4

jok3333 [9.3K]

Answer:

She can buy 62 smoothies

Step-by-step explanation:

6 0

3 years ago

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Convert the polar representation of this complex number into its standard form z=4(cos150+isin150).

Katen [24]

Answer:

B

Step-by-step explanation:

Using the exact values

cos150° = - cos30° = - $\frac{\sqrt{3} }{2}$

sin150° = sin30° = $\frac{1}{2}$

Given

z = 4(cos150° + isin150° ) , substitute values

= 4(- $\frac{\sqrt{3} }{2}$ + $\frac{1}{2}$ i )

= - 2 $\sqrt{3}$ + 2i , that is

(- 2 $\sqrt{3}$ , 2 ) → B

7 0

2 years ago

A) Factorise a^2 - b^2

Vadim26 [7]

Answer:

a·a-b·b

Step-by-step explanation:

7 0

2 years ago