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3 years ago

9

Mathematics

2 answers:

Ymorist [56]3 years ago

6 0

A. 12 dollars. 84 /7=12

velikii [3]3 years ago

5 0

Divide 84 by 7 and you will get 12

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What is the value of the expression 3x2 – 2y, if x - -2 and y = -4. 0 20 52 O-8 02

Dafna11 [192]

Answer:

I think the answer is 20....I'm so sorry if that is wrong :[

6 0

3 years ago

Please help!!!! I obviously don’t need 10,11,and 12

tatyana61 [14]

For 1-5, you add up both angles that are stated and then subtract that number from 180 to get the missing angle.
For 6, the top angle is equal to 40 since half of it equals 20. The other 2 angles are equivalent, so we subtract 40 from 180 and then divide that number by 2 to get your answer.
For 7, you see two triangles on one. The first triangle has the angles of 60 and 60, and since a triangles angles add up to 180, we add both angles and subtract it from 180 to get that side. Since a straight angle is also equal to 180 degrees, the answer you just got and the answer you’re looking for are supplementary angles. So, you subtract that answer from 180 to get your answer.
For 8, you do the same thing with supplementary angles. Since the straight lines is equal to 180 degrees, we subtract 144 from it to get your answer.
For 9, we do the same thing that we did with number 7. The first triangles sides are 40 and 70, so we add those together and subtract it from 180 to get the missing side. That side and the one that you’re looking for are supplementary angles, so you subtract that side from 180 to get your answer.

3 0

3 years ago

Two-thirds of a number decreased by three is five equation form

enot [183]

Answer:

2/3x - 3 = 5

Step-by-step explanation:

Let x be the number

2/3x - 3 = 5

Add 3 to each side

2/3x-3+3 = 5+3

2/3x = 8

Multiply each side by 3/2

3/2*2/3x = 8*3/2

x = 12

5 0

3 years ago

It is asking what is the relationship between segment pq and p”q’

nadezda [96]

angles it sounds like but ik the struggle

7 0

3 years ago

The chemistry class was making 300 gallons of 30% isopropyl alcohol. They mixed 12% with 42%. How much of each did they use?

alexgriva [62]

Answer:

The chemistry class mixed 120 gallons of 12% isopropyl alcohol and 180 gallons of 42% isopropyl alcohol.

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Amount of isopropyl alcohol made by the chemistry class = 300 of 30%

Amount of 12% isopropyl alcohol mixed by the chemistry class = x

Amount of 42% isopropyl alcohol mixed by the chemistry class = 300 - x

2. How much of each did they use?

Let's write our equation to solve for x, this way:

30% = 0.3, 12% = 0.12, 42% = 0.42

0.12x + 0.42 (300 - x) = 0.3 * 300

0.12x + 126 - 0.42x = 90

-0.3x = 90 - 126

-0.3x = -36

x = -36/-0.3

x = 120 ⇒ 300 - x = 180

Let's prove x = 120 is correct

0.12x + 0.42 (300 - x) = 0.3 * 300

0.12 * 120 + 0.42 (300 - 120) = 0.3 * 300

14.4 + 75.6 = 90

90 = 90

We proved x = 120 is correct

5 0

3 years ago