86÷9 using repeated subtraction

A chocolate chip cookie recipe requires one and three quarters cups of flour to one cup of chocolate chips. If four and two thir

nikitadnepr [17]

1 cup of chocolate chips for every 1and 3/4 cup of flour

so divide 4 and 2/3 x 1 and 3/4

turn them both into fractions

4 2/3 = 14/3

1 3/4 = 7/4

14/3 / 7/4 = 14/3 x 4/7 = 56/21 = 2 and 2/3 cups of chocolate chips are needed

8 0

3 years ago

Can anyone please help me with this? i need a step by step explanation please! very appreciated:)

EastWind [94]

Answer:

Step-by-step explanation:

x and y are variables. That means they represent numbers that are unknown. When we solve for x or y, we are trying to find what number the variable represents.

Y is a number that equals both 5x-9 and 3x+7. If it is a number, it can only have one value, so we can say that 5x-9 and 3x+7 have the same value.

In other words, 5x-9 = 3x+7.

Another way of thinking about this step is substitution. y=3x+7, so in the equation y=5x-9, we can replace the y with 3x+7. It will give 3x+7 = 5x-9.

In either case, we have this new equation

5x-9 = 3x+7.

From here it's just simple algebra- subtract 3x from each side

2x -9 = 7

and add 9 to each side

2x = 16

and divide each side by 2.

x = 8.

All these steps work because if two things equal each other, when you do the same thing to both of them (such as add 9), the new values will still equal each other.

Now that we know that x = 8, we can take one of the original equations

y=5x-9

and put 8 in for x.

y=5*(8) -9.

If x represents the value 8, we can obviously switch out x for 8.

Now simplify

y=40 -9

y = 31

Now we know that x = 8 and y = 31.

5 0

3 years ago

Read 2 more answers

2/3 (t+5) = 8<br><br>what does t equal?

Galina-37 [17]

Hey bro use an app called photo math it tells you ghe answer and teaches you how to do it

6 0

3 years ago

If angle 4 =2x+7 and. angle 8 =3x-13 find x for both equations

dybincka [34]

Answer:

2x +3x =7-13=4+8

Step-by-step explanation:

5x= -6= 12

8 0

3 years ago

Anyone know how to do trig? Given tan Ф = 4/5, find all other trig functions.

mars1129 [50]

9514 1404 393

Answer:

sin(Ф) = (4/41)√41; csc(Ф) = (√41)/4
cos(Ф) = (5/41)√41; sec(Ф) = (√41)/5
tan(Ф) = 4/5; cot(Ф) = 5/4

Step-by-step explanation:

The mnemonic SOH CAH TOA can help you with three of the functions. Then you need to remember the relations between those and the other three.

Tan = Opposite/Adjacent

tan(Ф) = 4/5

This suggests you can draw a triangle like the one attached that has adjacent side 5 and opposite side 4. Then hypotenuse can be found from the Pythagorean theorem:

AC² = AB² +BC² = 5² +4² = 41

AC = √41 . . . . . hypotenuse

Then the other trig functions are ...

Sin = Opposite/Hypotenuse

sin(Ф) = 4/√41 = (4/41)√41

Cos = Adjacent/Hypotenuse

cos(Ф) = 5/√41 = (5/41)√41

And the reciprocal functions are ...

csc(Ф) = 1/sin(Ф) = (√41)/4

sec(Ф) = 1/cos(Ф) = (√41)/5

cot(Ф) = 1/tan(Ф) = 5/4

7 0

3 years ago