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8_murik_8 [283]

3 years ago

13

A culinary club earns $1190 from a dinner service. They sold 34 adult meals and 51 student meals. an adult meal costs twice as m

uch as a student meals. What is the cost of an adult meal ?

2 answers:

Murrr4er [49]3 years ago

5 0

59 gdgdksgfjjjkkkkjjjjjjjjjjjjjjjj

luda_lava [24]3 years ago

5 0

Answer:

20

Step-by-step explanation:

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Use substitution to solve the system of equations.

gtnhenbr [62]

(3.75, 5.5)

(Work is attached )
When using substitution , you substitute with a variable that is already by itself. In this case, the variable “y” is already by itself and equal to x+ 1.75 . you substitute that for the the y in the other equation and solve for the other variable which is “x”. After you solve for x , to find your y value, you have to substitute the x value in for either equation.

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2 years ago

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sammy [17]

Answer:

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3 years ago

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Find the derivative of sinx/1+cosx, using quotient rule

Mrrafil [7]

Answer:

f'(x) = -1/(1 - Cos(x))

Step-by-step explanation:

The quotient rule for derivation is:

For f(x) = h(x)/k(x)

$f'(x) = \frac{h'(x)*k(x) - k'(x)*h(x)}{k^2(x)}$

In this case, the function is:

f(x) = Sin(x)/(1 + Cos(x))

Then we have:

h(x) = Sin(x)

h'(x) = Cos(x)

And for the denominator:

k(x) = 1 - Cos(x)

k'(x) = -( -Sin(x)) = Sin(x)

Replacing these in the rule, we get:

$f'(x) = \frac{Cos(x)*(1 - Cos(x)) - Sin(x)*Sin(x)}{(1 - Cos(x))^2}$

Now we can simplify that:

$f'(x) = \frac{Cos(x)*(1 - Cos(x)) - Sin(x)*Sin(x)}{(1 - Cos(x))^2} = \frac{Cos(x) - Cos^2(x) - Sin^2(x)}{(1 - Cos(x))^2}$

And we know that:

cos^2(x) + sin^2(x) = 1

then:

$f'(x) = \frac{Cos(x)- 1}{(1 - Cos(x))^2} = - \frac{(1 - Cos(x))}{(1 - Cos(x))^2} = \frac{-1}{1 - Cos(x)}$

4 0

3 years ago

A roller coaster begins at 418 feet above sea level. Then it descends 384 feet. What is the height of the roller coaster after i

Ainat [17]

Answer:

34 feet

Step-by-step explanation:

418 - 384 = 34 feet above sea level

3 0

3 years ago

Evaluate 1x + y, for x = 8 and y=-15.<br> 7 <br> -7<br> 23<br> -23

statuscvo [17]

Answer:

B) -7

Step-by-step explanation:

x+y

8+(-15)=8-15=-7

5 0

3 years ago