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3 years ago

A square of side 2cm

Mathematics

1 answer:

Evgen [1.6K]3 years ago

4 0

Answer: A square of 2cm sides has a perimeter of 8, and an area of 4.

Step-by-step explanation:

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Kiran starts at 9:00 am by bicycle to reach office. She cycles at the speed of 8 km/hour and reaches the office at 9:15 am. By h

Ivenika [448]

Answer:

v = 12 km/h

Step-by-step explanation:

To find how much she should increase the speed first we need to find the distance traveled:

$d = v*t$

Where:

d: is the distance traveled =?

v: is the velocity = 8 km/h

t: is the time = 15 min (9:00 to 9:15)

$d = v*t = 8 km/h*15 min*\frac{1 h}{60 min} = 2 km$

Now, we can find the speed:

$v_{f} = \frac{d}{t} = \frac{2 km}{10 min*\frac{1 h}{60 min}} = 12 km/h$

Therefore, she should increase the speed to 12 km/h to reach the office at 9:10 am.

I hope it helps you!

6 0

3 years ago

Find the value of x when y= –22 .<br> y=5x - 7

kaheart [24]

X=-3 because 5x-3=-15, -15-7 =-22

8 0

3 years ago

juanita is watering her lawn using the water stored in her rainwater tank. the water level in the tank drops 1/3 inch every 10 m

Harrizon [31]

Fraction of tank drops in every 10 minutes = 1/3 inches.

We need to find the expected change in the tank's water level after 2.25 hours.

Let us convert 2.25 hours in minutes.

1 hours = 60 minutes.

2.25 hours = 2.25 × 60 = 135 minutes.

<em>We need to divide 135 by 10.</em>

We get 13.5.

Now, we need to <em>multiply 1/3 by 13.5</em>, we get.

13.5/3 = 4.5 inches.

<h3>So, tank would drop 4.5 inches after 2.25 hours.</h3>

8 0

4 years ago

1. Scientific Notation and Percent. (Based on the ideas in Objective 1 and Objective 4.) 6 points

vlabodo [156]

Answer: $1.715*10^{12}$ skin cells were not burned.

Step-by-step explanation:

<h3><u> The complete exercise is: Two percent of Sennie's skin cells were burned when she escaped from a fire. If $3.5*10^{10}$ of her skin cells were burned then, how many skin cells were not burned?</u></h3><h3 />

Let be "x" the number of Sennie's skin cells that were not burned when she escaped from the fire.

According the the data given in the exercise, you know that 2% represents $3.5*10^{10}$ of Sennie's skin cells that were burned. This means that the percent of her skin cells that were not burned is:

$100\%-2\%=98\%$

With this information you can write the following proportion:

$\frac{3.5*10^{10}}{2}=\frac{x}{98}$

Solving for "x", you get:

$(98)(\frac{3.5*10^{10}}{2})=x\\\\x=171.5*10^{10}$

To express the result in Scientific notation, the decimal point must be after the first digit; then you must move the decimal point two places to the left:

$x=1.715*10^{12}$