7+(8+12)=____+12? Which property was used?

Answers

Answer 1

Answer: I know the number ypu have to fill in would be 15 I believe that is the commutative or associative property or something with addition

Answer 2

Answer: If is distributive property

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Mr yoshi has 75 papers .he graded 60 papers and he had a student teacher grade the rest. What percent of the papers did each person grade .plzTell me what strategy to use ...thank u

Answers

15 x
--- --- 》75x=1500
75 100 ---- ------- 》x= 20%
75 75

Which ordered pair is the solution to the system of equations?-3x+4y=-20
x+4y=-4
A.
(8, 1)

B.
(−12, 2)

C.
(−4, −8)

D.
(4, −2)

Answers

x+4y=-4
x=-4-4y

-3(-4-4y)+4y=-20
12+12y+4y=-20
16y=-20-12
y=-32/16
y=-2

x=-4-4(-2)
x=-4+8
x=4

D.(4,2)

one winter day,the temperature ranged from a high 20°F to a low -25°F. By how many degrees did the temperature drop?

Answers

Answer:

$45^(\circ)F$

Step-by-step explanation:

We have been given that one winter day,the temperature ranged from a high 20°F to a low -25°F.

To find the degrees by which temperature dropped, we will find difference between the final temperature and initial temperature.

$-25^(\circ)F-20^(\circ)F=-45^(\circ)F$

Since our difference is negative, therefore, the temperature dropped 45 degrees Fahrenheit.

45 degrees. 20 - (-25)

66.15 divided by 0.63

Answers

How many times does 0.63 go into 66.15? The answer is 105

If 5 times a number is increased by 4 the result is at least 19.

Answers

Actually if you multiply 5x1 then you get 5 then if you increase it by 4 you would only get 9. But thats just an example.

5x+4 $\geq$ 19

x would be the number that you are looking for. Since the question says that is is AT LEAST 19, you can make the equation greater than or equal to.

Photo above! How do I find the area of this?

Answers

Area of the figure=area of the square - area of the rectangle 1 - area of the rectangle 2.

Area of the square=side x side=12 * 12 =144
Area of the rectangle 1=8 *5=40
Area of the rectangle 2=5 * (12-8)= 5 * 4=20

Area of the figure=144 - 40 -20=84

Answer : 84

Well, the formula to find the area of something is base times height, so you'll have to multiply the base and height at the bottom, which is 12 times 12 which is 144, and then find the area of the missing/cut-out piece which is 8 times 5 which will be 40, and then subtract the two areas, (144 - 40), which will give you your final area of 104 square inches.
I hope I helped! =D

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