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2 years ago

Find the sum of 3/4 - 2/5

Mathematics

2 answers:

nignag [31]2 years ago

8 0

Answer:

7/ 20 LOL

Step-by-step explanation:

Aleksandr-060686 [28]2 years ago

6 0

Answer:

7/20

Step-by-step explanation:

Hope this help and have a great day!!!

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60=F(15) Please solve this and show work, please

Lubov Fominskaja [6]

Answer:

f = 4

Step-by-step explanation:

60= 15f

divide both side by 15

f = 4

3 0

3 years ago

18/4(-11.5) Answer that question Thank You!!!

Paha777 [63]

Answer: 207/4 or -51.75

Step-by-step explanation:

3 0

2 years ago

A bridge in the shape of an arch connects two cities separated by a river. The two ends of the bridge are located at (–7, –13) a

sdas [7]

Answer:

$y=-\dfrac{13}{49}x^2$

Step-by-step explanation:

The shape of an arch corresponds to a parabola.

the general equation for a parabola is:

$y=ax^2+bx+c$

we're given three coordinates: (-7,-13),(7,-13) and (0,0)

so we can plug these values in the general equation to make 3 separate equations:

(x,y) = (-7,-13)

$-13=a(-7)^2+b(-7)+c$

$49a-7b+c=-13$

(x,y) = (7,-13)

$-13=a(7)^2+b(7)+c$

$49a+7b+c=-13$

(x,y) = (0,0)

$0=a(0)^2+b(7)+c$

$c=0$

so we have three equations. and we can solve them simultaneously to find the values of a,b, and c.

we've already found c = 0, let's use substitute it to other equations.

$49a-7b+c=-13\quad\Rightarrow\quad49a-7b=-13$

$49a+7b+c=-13\quad\Rightarrow\quad49a+7b=-13$

we can solve these two equation using the elimination method, by simply adding the two equations

$\quad\quad49a-7b=-13\\+\quad49a+7b=-13$

------------------------------

$\quad\quad 98a=-26$

$\quad\quad a=-\dfrac{13}{49}$

Now we can plug this value of a in any of the two equations.

$49a-7b=-13$

$49\left(-\dfrac{13}{49}\right)-7b=-13$

$-13-7b=-13$

$-7b=0$

$b=0$

We have the values of a,b, and c. We can plug them in the general equation to find the equation of the arch.

$y=\left(-\dfrac{13}{49}\right)x^2+0x+0$

$y=-\dfrac{13}{49}x^2$

$49y=-13x^2$

This our equation of the arch!

5 0

3 years ago

a chicken needs cooking for 2 hours 20 min it needs to be cooked at 1pm what time do i need to start cooking

castortr0y [4]

So it cooks for 2 hrs and 20 minutes......and it has to be done by 1 pm.

so from 1 p.m. - 2 hrs = 11 a.m........- 20 minutes = 10:40 a.m

start cooking at 10:40 a.m. and it will be done by 1 p.m

8 0

2 years ago

Read 2 more answers

Jan needs 1/3 of chocolate chips to make cookies and 3/4 cup to make brownies. How many cups does she need altogether?

viktelen [127]

Answer:

She needs 1½ cups

Step-by-step explanation:

Number of cups she needs altogether = 1/3 + 3/4 =(4+9)/12 = 13/12 = 1½

4 0

2 years ago

Read 2 more answers