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IRINA_888 [86]
3 years ago
7

A triangle with vertices at A (0,2), B(12,-5), (12,9)

Mathematics
1 answer:
vodomira [7]3 years ago
5 0

Answer:b

Step-by-step explanation:

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A2=b2=c2 solve for a
Over [174]

Step-by-step explanation:

A²+B²=C²

A²+4²=5²

A²+16=25

    -16 -16

A²=9

√A=√9

  A=3

3 0
2 years ago
A toxic radioactive substance with the density of 4 mg/cm² is detected in the been detected in the ventilating ducts that was us
Kruka [31]
The formula for half-life is:

A = P(0.5)^{t/h}

A is the amount remaining, P is the initial amount, t is the time that has passed, and h is the half-life of the substance.  Plug in the values that you know and solve:

4 = P(0.5)^{35/20} \\ \\ 4 = P(0.5)^{1.75} \\ \\ P = \frac{4}{0.5^{1.75}} \\ \\ P \approx 13.4543426441

Rounded to the nearest whole number, the density of the substance was about 13<span>mg / cm².</span>
8 0
3 years ago
Write another way to describe 43
Leno4ka [110]
43 
= 40+ 3
= 4 tens+ 3 ones.

Another way to describe 43 is 4 tens and 3 ones~
6 0
3 years ago
Read 2 more answers
A student is trying to calculate the density of a ball. She already knows the mass, but she needs to determine the volume as wel
mario62 [17]
<h2>Answer and Explanation:</h2><h2 />

The density of a substance is defined as its mass per unit volume. In a mathematical language, this can be written as follows:

\rho=\frac{m}{V} \\ \\ \\ Where: \\ \\ \rho: \ density \\ \\ m:mass \\ \\ V:Volume

From the problem, a student is trying to calculate the density of a ball. She already knows the mass, but is facing a problem because she also needs to find the volume. From geometry, we know that the volume of a sphere is:

V=\frac{4}{3} \pi r^{3}

Since a ball is a sphere, then the student can use this formula. She just need to measure the radius of the ball and compute the Volumen, then she have to plug both the value of the mass and the value of the Volume in the equation \rho=\frac{m}{V}. An easy way to find the radius is to take the measure of the diameter of the ball and divide that value by 2.

6 0
3 years ago
Melissa is mailing packages. Each small package costs her
Gnoma [55]
6x2.40=14.4
4.30x3=12.9
add.
12.90
14.40
=27.30
3 0
3 years ago
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