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musickatia [10]
3 years ago
8

What is the value of x in the rhombus below?

Mathematics
2 answers:
GuDViN [60]3 years ago
7 0

Answer:

Option C

21\°

Step-by-step explanation:

we know that

The two diagonals of a rhombus are perpendicular

so

Let

O------> the center of the rhombus

m∠AOB=90\°

Remember that

The sum of the internal angles of a triangle is equal to 180\°

therefore

in the triangle AOB

m∠AOB+m∠OAB+m∠OBA=180\°

substitute the values

90\°+(2x+1)\°+(2x+5)\°=180\°

solve for x

(4x+6)\°=90\°

4x=90\°-6\°

x=21\°

Maurinko [17]3 years ago
5 0
Look into my attachment

in rhombus ABCD, ∠AOB = 90°

Look at ΔAOB
the sum of inner angles = 180°
∠BAO + ∠AOB + ∠ABO = 180°
2x + 1 + 90 + 2x + 5 = 180°
4x + 96 = 180
4x = 84
x = 21

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FrozenT [24]

Answer:

Mechanic 1: $55 per hour

Mechanic 2: $105 per hour

Step-by-step explanation:

Given

Represent the rate of the first mechanic with x and the second with y.

So, we have:

x + y = 160

The total earnings is: $1850, so we have:

5x + 15y = 1850

Required

Determine the rate of each

The equations are:

x + y = 160 --- (1)

5x + 15y = 1850 --- (2)

Divide (2) through by 5

x + 3y = 370 --- (3)

Subtract (1) from (3)

x - x + 3y - y = 370 - 160

2y = 210

Divide through by 2

y = \frac{210}{2}

y = 105

Substitute 105 for y in (1)

x + y = 160

Make x the subject

x = 160 - y

Substitute 105 for y

x = 160 - 105

x = 55

Hence:

Mechanic 1: $55 per hour

Mechanic 2: $105 per hour

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