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Svet_ta [14]
3 years ago
9

3) -2x – 3y = -7 -4x + y = 21 A) (-8, 4) C) (2, 4) B) (-4,5) D) No solution

Mathematics
1 answer:
ValentinkaMS [17]3 years ago
7 0

Answer: B) (-4,5)

Step-by-step explanation:

Begin the problem by solving for y with the second equation. Add -4x to both sides of the equation so it reads y=4x+21. Then, substitute y into the first equation and solve. -2x-3(4x+21)=-7 turns into -14x-63=-7, which becomes -14x=56. Divide 56/-14 to get -4 for x. Since only one answer has -4 as an option for x, that's the correct answer.

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Ali, Ben, and Cliff plant seedlings in their neighborhood park. Ali plants 40% of the total number of seedlings, Ben plants 45%
Juli2301 [7.4K]

Answer:

580 seedlings altogether.

Step-by-step explanation:

Given that,

Ali plants 40% of the total number of seedlings, Ben plants 45% of the total number of seedlings, and Cliff plants the rest of the seedlings. Cliff plants 87 seedlings.

The percentage of the seedling planted by Cliff = 100% - 45% - 40% = 15%

<em>Let x = the total number of seedlings</em>

<em />15\%\ of\ x=87\\\\x=\dfrac{87\times 100}{15}\\\\x=580

Hence, three boys plant 580 seedlings altogether.

7 0
2 years ago
The parallelograms are similar. Find x.
amid [387]

Answer:

40

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Step-by-step explanation:

4÷1/2=8

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7 0
3 years ago
Please please help please ASAP
Vedmedyk [2.9K]

Answer:

VT = 50√3 , PT = 50

Step-by-step explanation:

Given

PV = 100

With reference angle 60°

hypotenuse (h) = 100

perpendicular (p) = ?

Now

Sin 60° = p/h

√3 / 2 = p / 100

p = √3 * 100 / 2

p = 50√3

Also

With reference angle 30°

hypotenuse (h) = 100

perpendicular (p) = ?

sin 30° = p/h

1/2 = p / 100

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Hope it will help :)

8 0
3 years ago
The measure of _A is 18° greater than the measure of _B. The two angles are complementary. Find the
kozerog [31]

Answer:

angle A=54 degree

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Step-by-step explanation:

let angle B be x

angle A=x+18

since they are complementary angles sum of these two angles will be 90 degree

x+x+18=90

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2x=72

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for angle A

x+18

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for angle B

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=36 degree

4 0
3 years ago
A set of twins have agreed to take part in an observational study. Each of the twins will wear a microphone that will record eve
Ivan

Answer: the answer is overt and structured

7 0
3 years ago
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