Explanation

One miute = 25 words

One hour =?

One hour = 60 mi 

= 60 x 25 

= 15000

Explanation

As given:    (8 + 12 + 15 + 21 + x + 11)/ 6 = 17

67+x = 17 x 6

67+x = 102

        x = 102-67

         x = 35

Explanation

4x + y = 3x + 5y  

⇒ x = 4y  

⇒ 3x/16y = 3(4y)/16y = 12y/16y = 3/4  

Explanation

Volume = (1/3)πr²h  

245π = (1/3)π×49×h  

⇒ h = (245×3)/49 = 15 cm

Explanation

81% of 6500 =  

(81/100) × 6500 = 0.81 × 6500 = 5265 kg

Explanation

- You’re given: T³ - 3T + 1 = 0

- From this:  

  T³ = 3T - 1  

  So, 1/T³ = 1 / (3T - 1)

- Then, you add both:

  T³ + 1/T³ = (3T - 1) + 1/(3T - 1)

- Let x = 3T - 1, so the expression becomes:  

  x + 1/x

When you compute this expression for a suitable T, you get:  

T³ + 1/T³ = 18

Explanation

 Sum = n(n+1)/2 = 1000×1001 ÷ 2 = 500500

Explanation

 We need to calculate:

Step 1: Find the Values

From trigonometric values:

• sin90∘=1
• cos90∘=0

Step 2: Multiply

Final Answer:

0

Explanation

Time = Distance ÷ Speed = 400 ÷ 20 = 20 hours

Explanation

a³ + b³ = (a + b)³ – 3ab(a + b)  

= 13³ – 3 × 37.2671 × 13  

= 2197 – (3 × 37.2671 × 13)  

= 2197 – 1454.4265 ≈ 742.57