Plug values into distance formula, step by step shown in picture :)
Answer:
52.24 km
Step-by-step explanation:
Given that,
The distance needed to stop a car, d, varies directly as the square of the speed, s, at which it is travelling.
d = ks²
Where
k is constant
When s₁ = 70 km/hr, d₁ = 40 m, s₂ = 80 km/hr, d₂ = ?
So,
![\dfrac{d_1}{d_2}=\dfrac{s_1^2}{s_2^2}\\\\d_2=\dfrac{d_1s_2^2}{s_1^2}\\\\d_2=\dfrac{40\times 80^2}{70^2}\\\\d_2=52.24\ km](https://tex.z-dn.net/?f=%5Cdfrac%7Bd_1%7D%7Bd_2%7D%3D%5Cdfrac%7Bs_1%5E2%7D%7Bs_2%5E2%7D%5C%5C%5C%5Cd_2%3D%5Cdfrac%7Bd_1s_2%5E2%7D%7Bs_1%5E2%7D%5C%5C%5C%5Cd_2%3D%5Cdfrac%7B40%5Ctimes%2080%5E2%7D%7B70%5E2%7D%5C%5C%5C%5Cd_2%3D52.24%5C%20km)
So, the new distance is 52.24 km.
Answer:
The value of 2 pennies and 3 dimes is 17¢. The value of p pennies and d dimes is (p×1)+(d×5)
Step-by-step explanation:
Use the formula (p×1)+(d×5).
Insert the number of pennies and dimes into the formula: (2×1)+(3×5).
Solve the equation: (2×1)+(3×5)
= 2+(3×5)
= 2+15
= 17
So, there are 17¢ in 2 pennies and 3 dimes.
The answer for question 2 is the formula written above.
Answer:
The surface area is 1.5cm
Step-by-step explanation:
6/4=1.5cm