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2 years ago

Can you please HELP ME!! I have done question a but i need help on question b. For some people it may be easy but...

Mathematics

2 answers:

Nataliya [291]2 years ago

6 0

Step-by-step explanation:

a) 8x + 5x = 13x

b) 9f + 10f - 12f = 7f

hope it helps...

pickupchik [31]2 years ago

5 0

Answer:

1) 13x

2) 7f

Step-by-step explanation:

$1)8x + 5x \\ combine \: like \: terms \\ = 13x \\ \\ 2)9f + 10f - 12f \\ add \: 9f \: and \: 10f \: together = 19f \\ substract \: 19f \: from \: 12f \\ = 7f$

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MA_775_DIABLO [31]

Answer:

the answer is D

Step-by-step explanation:

7 0

3 years ago

F(x) = 3x + 2

Vinvika [58]

Answer:

g(f(x)) = 9x² + 12x + 5

Step-by-step explanation:

g(f(x))

= g(3x + 2) ← substitute x = 3x + 2 into g(x)

= (3x + 2)² + 1

to expand (3x + 2)² = (3x + 2)(3x + 2)

each term in the second factor is multiplied by each term in the first factor

3x(3x + 2) + 2(3x + 2) ← distribute both parenthesis

= 9x² + 6x + 6x + 4 ← collect like terms

= 9x² + 12x + 4

then

g(f(x)) = (3x + 2)² + 1 = 9x² + 12x + 4 + 1 = 9x² + 12x + 5

5 0

2 years ago

Raj has a full deck of 52 cards. Sydney chooses the queen of clubs and holds onto it. Then Yolanda chooses a card. What is the t

Ilya [14]

1/51 I believe is the answer

5 0

3 years ago

Read 2 more answers

Find the sine and cosine of each angle as a fraction and as a decimal. Round to the nearest hundredth.

lawyer [7]

Answer:

1st triangle:

sin(C): 0.64, $\frac{16}{25}$

cos(C): 0.8, $\frac{4}{5}$

Second triangle:

sin(C): 0.75, $\frac{\sqrt{5} }{3}$

cos(C): 0.67, $\frac{2}{3}$

Step-by-step explanation:

Using SOH CAH TOA, we know that to find the sin of an angle, it's Opposite/Hypotenuse.

To find the cos of an angle, it's adjacent/hypotenuse.

In the 1st triangle:

The adjacent to C is 16, the hypotenuse is 25.

$\frac{16}{25} = 0.64$ is the sin of C.

The adjacent to C is 20, and the hypotenuse is 25.

$\frac{20}{25} = 0.8$ is the cos of C.

In the second triangle:

The opposite to C is $\sqrt{5}$ and the hypotenuse is 2.

$\frac{\sqrt{5} }{2} \approx0.75$ is the sin of C.

The adjacent to C is 2 and the hypotenuse is 3.

$\frac{2}{3} \approx 0.67$ is the cos of C.

Hope this helped!

3 0

3 years ago

Read 2 more answers

Tammy makes $ 7 per hour plus $4 for each item she sells, and lisa makes $10 per hour plus 3.00 for each item she sells. in an h

Delvig [45]

Answer: 3

Tammy and Lisa will make the same amount of money when they each sell 3 items. It'll probably never happen, though, since Tammy is a much better saleswoman than Lisa. You should hear her in action: "What will it take to put you in this foot spa today?" What a pro.

Now let's do the same problem in symbols. We need to find the two equations described by the problem.

Tammy's line has a y-intercept of 7 and a slope of 4, so her equation is

y = 4x + 7.

Lisa's line has a y-intercept of 10 and a slope of 3, so her equation is

y = 3x + 10.

We've found a system of equations:

The problem asks how many items sold will give Tammy and Lisa the same amount of money, so we want to find x when the y-values on the two lines are the same. That is, we want to find where the lines intersect, which we can do by solving the system of equations. Why did one line cross the other line? To get to the other side. Oh...you've probably heard the version with the chicken.

For this system, it's easiest to use substitution. Since y = 4x + 7, we have

We think if each girl sells 3 items, they'll be paid the same. Let's check this: if Tammy sells 3 items, she makes 7 + 3(4) = 19 dollars.

And if Lisa sells 3 items she makes 10 + 3(3) = 19 dollars. It's a match.

3 0

3 years ago