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Romashka-Z-Leto [24]
3 years ago
6

Please explain to me EVERYTHING about percentages (7th grade level.) Tell me anything percentage related. Please and thank you !

Mathematics
1 answer:
Salsk061 [2.6K]3 years ago
7 0
What part in percentages are you having trouble with
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Could someone help me for this?
lina2011 [118]

Answer:

x = - \frac{5}{3} , x = \frac{5}{2}

Step-by-step explanation:

to find the points of intersection equate the 2 equations , that is

7x - 15 = 10 + 12x - 6x² ( subtract 10 + 12x - 6x² from both sides )

6x² - 5x - 25 = 0 ← factor the quadratic on left side

consider the factors of the product of the coefficient of the x² term and the constant term which sum to give the coefficient of the x- term

product = 6 × - 25 = - 150 and sum = - 5

the factors are - 15 and + 10

use these factors to split the x- term

6x² - 15x + 10x - 25 = 0 ( factor the first/second and third/fourth terms )

3x(2x - 5) + 5(2x - 5) = 0 ← factor out (2x - 5) from each term

(2x - 5)(3x + 5) = 0

equate each factor to zero and solve for x

3x + 5 = 0 ⇒ 3x = - 5 ⇒ x = - \frac{5}{3}

2x - 5 = 0 ⇒ 2x = 5 ⇒ x = \frac{5}{2}

3 0
1 year ago
Find the equation of the linear function represented by the table below in slope-
pav-90 [236]

Answer: y=-3x-2

Step-by-step explanation:

Using the values x=-2, y=4 and x=1, y=-5, the slope is \frac{-5-4}{1-(-2)}=-3.

So, the equation is:

y-4=-3(x+2)\\\\y-4=-3x-6\\\\y=-3x-2

3 0
1 year ago
Triangle DEF is a right triangle. What is the measure of ZEFD?<br> D<br> 57°<br> F<br> E
creativ13 [48]

Answer:

<h3>                33°</h3>

Step-by-step explanation:

Sum of measures of angles in any triangle is 180°

The maesure of right angle is 90°

So:  m∠EFD = 180° - 90° - 57° = 33°

6 0
3 years ago
Maria makes $16 per hour. She gets a 18% raise. What is her new hourly<br> rate?
Mariana [72]

Answer:

$18.88 per hour.

Step-by-step explanation:

We first need to find 18% of $16.

16 * 0.18 = 2.88

The pay rate increases by $2.88.

$16 + $2.88 = $18.88

Hope this helps.

8 0
2 years ago
The Maximus Electric Company will increase employee's yearly wages by 2.5% next year. An employee whose
Mamont248 [21]

Answer:

46,125

Step-by-step explanation:

2.5% = .025

45,000 * .025 = 1,125

45,000 + 1,125 = 46,125

4 0
3 years ago
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