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3 years ago

Help this is math i hate math

Mathematics

2 answers:

lorasvet [3.4K]3 years ago

7 0

Answer:

-3.125 or $-\frac{25}{8}$

Step-by-step explanation:

$-4\frac{3}{8} - (-1\frac{1}{4} )= -\frac{25}{8}$ or -3.125

Helga [31]3 years ago

4 0

Answer:

3 2/4

Step-by-step explanation:

You might be interested in

express the following shaded area using a definite integral. use geometry to calculate the area. please show work too

natima [27]

Answer:

Integrate( sqrt(9-x^2) from x=-3 to x=3)

Step-by-step explanation:

The equation for a full circle is (x-h)^2+(y-k)^2=r^2 where (h,k) is center and radius is r.

Your center, your (h,k) is (0,0). Your radius, your r, is 3.

So your equation is (x-0)^2+(y-0)^2=3^2 or more simply x^2+y^2=9.

We also must consider we don't have full circle.

Solving for y will give us the circle in terms of top half if we take positive values and bottom half if we take negative values. Since y is positive in the picture, you only see top half, we will only take the positive cases for y.

Subtracting x^2 on both sides gives: y^2=9-x^2

Square root both sides: y= sqrt(9-x^2)

(I did not choose -sqrt(9-x^2) because again y is positive).

So the x's in the picture range from -3 to 3.

The integral is therefore,

Integrate( sqrt(9-x^2) from x=-3 to x=3)

8 0

3 years ago

A collection of coins consisting of nickels dimes and quarters amount to 7.20. There are six more dimes than nickels and six mor

monitta

Answer:

9 nickles

15 dimes

21 quarters

Step-by-step explanation:

Number of nickels = N

Number of dimes = D

Number of quarters = Q

The following system can be modeled based of the given information:

$0.05N+0.10D+0.25Q=7.20\\D=N+6\\Q=D+6$

Solving the system:

$D=N+6\\Q=N+6+6=N+12\\0.05N+0.10*(N+6)+0.25*(N+12)=7.20\\0.4N=7.20-0.6-3\\N=9\\D=9+6=15\\Q=15+6=21$

The collection consists of 9 nickels, 15 dimes and 21 quarters.

7 0

3 years ago

FIRST CORRECT ANSWER WILL GET BRAINLIEST

mezya [45]

Answer:

They are parallel.

Step-by-step explanation:

They have the same slope, 7, and different y-intercepts, 4, -1/4, so they are parallel.

5 0

2 years ago

At a certain airport, 65% of the flights arrive on time. A sample of 10 flights is studied. Find the probability that all 10 of

babunello [35]

Answer:

So, the probability is P=0.0135.

Step-by-step explanation:

We know that at a certain airport, 65% of the flights arrive on time.

We get that p=0.65 and q=1-0.65=0.35.

We have 10 flights, so n=10.

We calculate the probability that all 10 of the flights were on time, so k=10.

We use the formulu:

$\boxed{P(X=k)=C^n_k \cdot p^k\cdot q^{n-k}}$

we get:

$P(X=10)=C^{10}_{10}\cdot 0.65^{10}\cdot 0.35^0\\\\P(X=10)=1\cdot 0.0135\cdot 1\\\\P(X=10)=0.0135\\$

So, the probability is P=0.0135.

5 0

3 years ago

Using the figure below, identify the measurements of Angle 3 and Angle 8.<br><br> Pls help

katrin2010 [14]

Answer:

Angle 3 is 75 degrees

Angles 8 is 105 degrees

Step-by-step explanation:

Angle 3: One line t, angle 3 and the one measure 105 are supplementary and equal to 180 degrees. Subtract 105 from 180.

Angles 8: The angle that measures 105 and angle 8 are alternate exterior angles. This means both angles are equal.

Hope this helps!

6 0

3 years ago