All categories

3 years ago

Need help please help the middle one

Mathematics

2 answers:

serious [3.7K]3 years ago

8 0

A because its true i know because i did it in school in fourth grade

olganol [36]3 years ago

6 0

The answer for the middle one is A

You might be interested in

Which of the following equations is true

lukranit [14]

Its the last one because 10 times 1 is 10 and 0 plus 10 still gives you 10

6 0

2 years ago

Read 2 more answers

What is the volume of this sphere?

Inga [223]

Answer:

$V=2143.57\ mm^3$

Step-by-step explanation:

Given that,

The radius of the sphere, r = 8 mm

We need to find the volume of the sphere. The formula for the volume of a sphere is given by :

$V=\dfrac{4}{3}\pi r^3$

Put all the values,

$V=\dfrac{4}{3}\times 3.14\times 8^3\\\\=2143.57\ mm^3$

So, the volume of the sphere is equal to $2143.57\ mm^3$ .

6 0

2 years ago

Element X decays radioactively with a half-life of eight minutes. If there are 800 g of element X, how long, to the nearest 10th

Harman [31]

Answer: 41.5 min

Step-by-step explanation:

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

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

Where:

$A=22 g$ is the final amount of the radioactive element

$A_{o}=800 g$ is the initial amount of the radioactive element

$t$ is the time elapsed

$h=8 min$ is the half life of the radioactive element

So, we need to substitute the given values and find $t$ from (1):

$22 g=(800 g) 2^{\frac{-t}{8 min}}$ (2)

$\frac{22 g}{800 g}=2^{\frac{-t}{8 min}}$ (3)

$\frac{11}{400}=2^{\frac{-t}{8 min}}$ (4)

Applying natural logarithm in both sides:

$ln(\frac{11}{400})=ln(2^{\frac{-t}{8 min}})$ (5)

$-3.593=-\frac{t}{8 min}ln(2)$ (6)

Clearing $t$ :

$t=41.46 min \approx 41.5 min$ This is the time elapsed

7 0

3 years ago

What is the unit length of a'b'

ladessa [460]

5
is thr correct answer

8 0

3 years ago

a touchdown in football counts for 6 points if n stands for the number of touchdowns, which equation represents how many points

irga5000 [103]

Answer:

Step-by-step explanation:

7 0

3 years ago