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Nitella [24]
3 years ago
5

The sum of 4 times a number and 7 equals 9

Mathematics
2 answers:
mestny [16]3 years ago
7 0

Answer:n=1/2

Step-by-step explanation:

4n+7=9

   -7   -7

4n=2

divide by 4 on both sides

n=1/2

Reptile [31]3 years ago
4 0

Answer:

0.5

Step-by-step explanation:

0.5 x 4 = 2, 2 + 7 = 9

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Please help me with this
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Answer: a=4, b=-8, c=-3

Step-by-step explanation: This equation isn't in standard form. To get it there, subtract -3 from both sides. This gets you an equation of 4x^2-8x-3.

The standard form is ax^2+bx+c.

A is the number before x^2 (4). B is the number before x, and since it's subtracted it's negative (-8). C is the last number, and since it's subtracted it's negative (-3).

7 0
3 years ago
1 4/5 miles - 5/6 mile=
aleksandr82 [10.1K]
14/5-5/6=84/30-25/30=59/30

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3 years ago
Mensuration of plane shapes
r-ruslan [8.4K]

Answer:

MENSURATION. Mensuration is the mathematical name for calculating the areas, volumes, length of sides, and other geometric parts of standard geometric shapes such as circles, spheres, polygons, prisms, cylinders, cones, etc., through the use of mathematical equations or formulas.

5 0
3 years ago
If CE bisects ZBCD and if m ZBCE = 3x - 6
horrorfan [7]

Answer:

m∠BCD = 90°

∠BCD is a right angle

Step-by-step explanation:

<em>If a ray bisects an angle, that means it divides the angle into two equal parts in measure</em>

∵ Ray CE bisects ∠BCD

→ Means divide it into two angles BCE and ECD which equal in measures

∴ m∠BCE = m∠ECD = \frac{1}{2} m∠BCD

∵ m∠BCE = 3x - 6

∵ m∠ECD = 2x + 11

→ Equate them to find x

∴ 3x - 6 = 2x + 11

→ Add 6 to both sides

∵ 3x - 6 + 6 = 2x + 11 + 6

∴ 3x = 2x + 17

→ Subtract 2x from both sides

∵ 3x - 2x = 2x - 2x + 17

∴ x = 17

∵ m∠BCE =  \frac{1}{2} m∠BCD

→ Substitute x in the measure of ∠BCE to find it, then use it to

   find m∠BCD

∵ m∠BCE = 3(17) - 6 = 51 - 6

∴  m∠BCE = 45°

∵ 45 = \frac{1}{2} m∠BCD

→ Multiply both sides by 2

∴ 90 = m∠BCD

∴ m∠BCD = 90°

→ The measure of the acute angle is less than 90°, the measure of

   the obtuse angle is greater than 90°, and the measure of the

   right angle is 90°

∴ ∠BCD is a right angle

6 0
3 years ago
Which sequence of transformations maps triangle PQR onto its image triangle P'Q'R'
erica [24]

Answer:

Reflect, Translate, Dilate

Step-by-step explanation:

1. Reflect across the y-axis

2. Translate the triangle (x + 1, y + 1)

3. Dilate PQR by: \frac{3}{2}

8 0
3 years ago
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