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2 years ago

EASY GRADE 7 MATH

Mathematics

2 answers:

neonofarm [45]2 years ago

3 0

Step-by-step explanation:

We can see from the image that z and 20° degrees are complementary, meaning they have a sum of 90°. From this, z = 70°. Hope this helps!

Blizzard [7]2 years ago

3 0

Answer:

Step-by-step explanation:

Z is part of a right angle so 90-20 is 70

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kareem is going for a run. he runs for 9.6 miles at a speed of 9 miles per hour, for how many hours does he run

masya89 [10]

You can set it up as a proportion like so....

9.6 = 9
 1 x

9.6x = 9
x = 9/9.6
x = 0.9375 hrs

7 0

2 years ago

The radioactive element americium-241 has a half-life of 432 years. How many years will it take a 10 gram mass of americium-241

geniusboy [140]

<h2>Answer: 816 years</h2>

This problem can be solved using the Radioactive Half Life Formula:

$A=A_{o}.2^{\frac{-t}{h}}$ (1)

Where:

$A=2.7g$ is the final amount of the material

$A_{o}=10g$ is the initial amount of the material

$t$ is the time elapsed (the quantity we are asked to find)

$h=432y$ is the half life of americium-241

Knowing this, let's find $t$ from (1):

$2.7g=(10g).2^{\frac{-t}{432y}}$

$\frac{2.7g}{10g}=2^{\frac{-t}{432y}}$

$0.27g=2^{\frac{-t}{432y}}$

Applying natural logarithm in both sides:

$ln(0.27g)=ln(2^{\frac{-t}{432y}})$

$-1.309=-\frac{t}{432y}ln(2)$

$-t=\frac{(-1.309)(432y)}{0.693}$

Finally:

$t=816y$

3 0

2 years ago

Can you plz help me with this

kiruha [24]

Answer:

1.794

Step-by-step explanation:

use the calculator

3 0

2 years ago

Read 2 more answers

Reduce your fraction into lowest terms.

neonofarm [45]

21/35= 3/5 this is the lowest fraction

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2 years ago

Find the distance between the points 10,2 and 5,-10

melomori [17]

The distance between the points is 13

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2 years ago

*EASY GRADE 7 MATH*

EASY GRADE 7 MATH