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3 years ago

PLEASE HELP!! MATH FINAL

Mathematics

1 answer:

DaniilM [7]3 years ago

8 0

Answer:

12 dimes, 8 nickels

Step-by-step explanation:

1. Set up an equation. Since we know the relationship between how many dimes and how many nickels that he has, we can create values for them.

2. Say that the number of nickels is x, so the number of dimes would be 2x-4.

3. Since we know that all of the coins that he has is 20 coins, we can say that 2x-4+x=20.

4. Solve the equation. We get 3x=24, and x=8.

5. That means that the number of nickels is 8, and the number of dimes is 2(8)-4, which is 12.

Answer: Timmy has 12 dimes and 8 nickels.

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This table shows the battery percentage of a phone after it

Vsevolod [243]

Answer:

yint -= (0,100) slope = -5 2/3

Step-by-step explanation:

yint is (0,100) because thats where it hits the y axis

slope equation is (y1-y2)/(x1-x2), just pick out any two points to do this with

(83-66)/(3-6)

17/-3

-5 2/3

5 0

3 years ago

Help please it will mean a lot to me

lukranit [14]

Answer: Whole= Part x %/100

Step-by-step explanation:

All of the other equations are algabraecally correct when solving for either part whole or percent but Whole $\neq$ Part x %/100

3 0

3 years ago

An analysis of the grades on the first test in History 101 revealed that they approximate a normal curve with a mean of 75 and a

QveST [7]

Answer:

b. 85

Step-by-step explanation:

Average grade (μ) = 75

Standard deviation (σ) = 8

Assuming a normal distribution, the z-score corresponding to the upper 10% of the test grades is z = 1.28.

The minimum grade 'X' within the top 10% is given by:

$z=\frac{X-\mu}{\sigma}\\1.28=\frac{X-75}{8}\\X=85.24$

Rounding to the nearest percent, the dividing point between an A and a B grade is 85.

3 0

3 years ago

he Sunny Days Apartment building has a cylindrical, above ground pool in the yard. The radius of the pool is 1.5 times its heigh

tatiyna

Answer:

5.54 feet.

Step-by-step explanation:

Let h be the height of the pool and r be the radius of the pool.

We have been given that volume of cylindrical pool in Sunny Days Apartment building is 1200 cubic feet.

We have been given that the radius of the pool is 1.5 times its height. We can represent this information in an equation as:

$r=1.5*h...(1)$

$\text{Volume of cylinder}=\pi r^2h$

Substituting equation (1) in volume formula we will get,

$\text{Volume of cylindrical pool}=\pi (1.5h)^2*h$

Substituting the given volume of pool in formula we will get,

$1200=\pi (1.5h)^2*h$

$1200=\pi*2.25*h^2*h$

$1200=\pi*2.25*h^3$

Let us divide both sides of our equation by 2.25 pi.

$\frac{1200}{2.25\pi}=\frac{\pi*2.25*h^3}{2.25\pi}$

$169.7652726=h^3$

Let us take cube root of both sides of our equation.

$\sqrt[3]{169.7652726}=h$

$5.537=h$

$h=5.537\approx 5.54$

Therefore, the height of the pool is approximately 5.54 feet.

8 0

3 years ago

5/4 + 4(1/4x1/4)<br><br> Solve

vfiekz [6]

So for this we're going to use this rule: a/b x c/d = ac/bd

simplify 1 x 1 to 1

simplify 4 x 4 to 16

4 x 1/16 to 4/16

simplify 4/16 to 1/4

simplify to 6/4

Lastly simplify

Answer: 3/2

*In decimal form it would be 1.5

5 0

3 years ago