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klemol [59]
3 years ago
15

Expand the following: 4(a + 3b - 5c).

Mathematics
2 answers:
Maslowich3 years ago
6 0

Answer:

4a+12b-20c

Step-by-step explanation:

Use the distributive property, multiply the number on the outside to everythign on the inside.

4*a=4a

4*3b=12b

-5c*4=-20c

GarryVolchara [31]3 years ago
3 0
Answer;

Explanation:

4(a + 3b - 5c)
= (4 x a) + (4 x 3b) - (4 x 5c)
= 4a + 12b - 20c
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five years ago a man was seven times as old as his son. five years hence the gather would be three times as old as his son. find
babymother [125]
Father = x
son = y
x-5 = 7(y-5)
x +5 = 3(y+5) solve the system

x-5 = 7y-35
x+5 = 3y +15

x-5 = 7y-35
-x-5 = -3y -15
-10 = 4y -50
+50 +50
40 = 4y
10 = y

Solve for X
x+5 = 3(10) + 15
x+5 = 45
x = 40

The father is 40yrs old and the son is 10yrs old.
5 0
3 years ago
Draw a quadrilateral in which all sides are the same length and all angles are right angles. Then name the quadrilateral
Tju [1.3M]
Answer:
Just draw a square
8 0
3 years ago
On a coordinate plane, 4 lines are shown. Line L M goes through (negative 5, negative 3) and (0, 3). Line N O goes through (nega
miv72 [106K]

Answer:

The slope of line LM is perpendicular to the given line.

Step-by-step explanation:

L (- 5, - 3), M (0, 3)

N (- 6, - 5) , O (0, 0)

J (- 6, 1) , K (0, - 4)

Slope of given line = -5/6

Slope of perpendicular line = 6/5

Slope of line LM

\frac{3 + 3}{0 + 5}=\frac{6}{5}

Slope of line NO

\frac{0+5}{0+6}=\frac{5}{6}

Slope of line JK

\frac{-4-1}{0+6}=\frac{-5}{6}

4 0
3 years ago
on the last 5 quizzes, marco has earned a total of 21 out of 25 possible points. if he has a perfect score on the next several q
nevsk [136]

Using the mean concept, it is found that we will need 15 more points to bring up his average up to 90%.

The mean of a data-set is the <u>sum of all observations divided by the number of observations</u>.

In this problem:

  • In the first 5 observations, total of 21 out of 25 points, hence the mean for these observations is \frac{21}{25} = 0.84.
  • In the next n observations, mean of 1.

Hence, the mean is:

M = \frac{0.84(5) + n}{5 + n} = \frac{4.2 + n}{5 + n}

We want the mean to be of 0.9, thus:

M = 0.9

\frac{4.2 + n}{5 + n} = 0.9

4.2 + n = 0.9n + 4.5

0.1n = 0.3

n = \frac{0.3}{0.1}

n = 3

3 more testes are need, each worth 5 points, hence, 15 more points are needed to bring up his average up to 90%.

A similar problem is given at brainly.com/question/25323941

6 0
3 years ago
Can someone do this for me and if so marking brainliest. Urgent
8_murik_8 [283]

Answer:

1. 1/3, 4

2. 3/5, -2

3. 4, 1

4. -3/2, 3

5. 1, 4

Step-by-step explanation:

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- The y-intercept is where the number hits the y-axis when at 0.

6 0
3 years ago
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