3 years ago

You drive your car for 3 hours at an average speed of 130 km per hour. How far did you go? *

Mathematics

1 answer:

stich3 [128]3 years ago

4 0

The answer is 390km. You just multiply 130 x 3.

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The meal tax at a restaurant is 5%. What is the tax on a dinner that costs $24?

Rudik [331]

The tax is the money on top of the original cost of the dinner. So, we need to find 5% of 24, as that is what the tax is at the restaurant - 5% of the price.

24 x 0.05 = 1.20

The tax on a dinner that costs $24 is $1.20.

Hope this helps!! :)

6 0

3 years ago

The mass of a carbon atom is 1.994 × 10-23 grams. The mass of a hydrogen atom is 1.67 × 10-24 grams. What is the difference of t

Bezzdna [24]

Solving:
$1.994*10^{-23}\:-\:1.67*10^{-24} = 
$
$(1.994 - 0.167 )*10^{-23}$
$\boxed{\boxed{1.827*10^{-23}\:grams}}\end{array}}\qquad\quad\checkmark$

4 0

3 years ago

Determine whether each ordered pair is a solution of the system.

Stolb23 [73]

According to the system:

5 – 7x + 2y² = -10

1 – 5x – 2y = -22

______________

a) No ; (4, 6) is not a solution to the

system. This point does not touch either equation.

b) No ; (6, 4) is not a solution to the system. This point does not touch either equation.

Solutions:

$( \frac{122 - 3 \sqrt{101}}{25}, \frac{ - 7 +3 \sqrt{101}}{10}) ≈ (3.674, 2.315) \\ ( \frac{122 + 3 \sqrt{101}}{25}, \frac{ - 7 - 3 \sqrt{101}}{10}) ≈ (6.086, -3.715)$