All categories

2 years ago

Please help me with this

Mathematics

2 answers:

Simora [160]2 years ago

6 0

Answer:

D -55

Step-by-step explanation:

-55, since we put -1 and -3 instead of x and y. We multiply the result in the brackets by five. This gives us five

solniwko [45]2 years ago

6 0

Answer:

The answer is C: -45

Step-by-step explanation:

You might be interested in

Divide 40x/ 64y by 5x/ 8y A. 1 B. 3/4 C. 25x^2/ 64y^2 D. 25/64

Mademuasel [1]

(40x/64y)/(5x/8y)

(40x/64y)(8y/5x)

320xy/(320xy)

1

5 0

3 years ago

Read 2 more answers

Two cars started from the same point and traveled on a straight course in opposite directions for exactly 2 hours, at which time

OlgaM077 [116]

Answer with Step-by-step explanation:

Let speed of one car=x miles/h

Speed of second car=x+8 mi/h

Time,t=2 hours

Distance between two cars=208 miles

We have to find the average speed for each car for 2-hour trip.

Distance= $Speed\times time$

Distance traveled by one car=2x

Distance traveled by second car=2(x+8)

According to question

$2x+2(x+8)=208$

$2x+2x+16=208$

$4x=208-16$

$4x=192$

$x=\frac{192}{4}=48$

Speed of one car=48mph

Speed of second car=48+8=56mph

5 0

3 years ago

Erica walked down a trail into a valley.

inysia [295]

Answer:

Erica's vertical distance from the top of the valley (in kilometers) after walking 2 kilometers along the trail is T.

Step-by-step explanation:

It is given that V(d) models Erica's vertical distance from the top of the valley (in kilometers) after walking d kilometers along the trail.

We need to find the meaning of V(2)=T.

On comparing V(d) and V(2), we get d=2.

Since V(d) models Erica's vertical distance from the top of the valley (in kilometers) after walking d kilometers along the trail, therefore V(2) models Erica's vertical distance from the top of the valley (in kilometers) after walking 2 kilometers along the trail.

$V(2)=T$

It means Erica's vertical distance from the top of the valley (in kilometers) after walking 2 kilometers along the trail is T.

7 0

2 years ago

What is the period of the function y= 3/2 cot(3/5x) +5?

finlep [7]

Answer:

D; 5pi/3 units

Step-by-step explanation:

Here, we want to find the period of the function;

y = 3/2 cot (3/5x) + 5

By definition, the period of a function is the interval between two matching points in the function.

Let’s say it is the distance between two peaks, crests, etc on a function.

To find the value of the period. We shall standardize the function.

What this means is that we shall be writing the function in the standard form.

The standard form is as follows;

f(x) = A trig(Bx -C) + D

Where trig refers to the accompanying trigonometric function in question.

Comparing this standard form with our question, we can see that;

A is 3/2

B is 3/5

C is 0

D is 5

Now for cot and tan functions, we shall need to divide pi by the absolute value of B

Thus we have; pi divided by 3/5 which gives 5pi/3 units

7 0

3 years ago

The lengths of nails produced in a factory are normally distributed with a mean of 6.13 centimeters and a standard deviation of

Novay_Z [31]

Answer:

Bottom 7%: L= 6.04 cm

Top 7%: L= 6.22 cm

Step-by-step explanation:

Mean length of the population (μ) = 6.13 cm

Standard deviation (σ) = 0.06 cm

The z-score for any given length 'X' is:

$z=\frac{X-\mu}{\sigma}$

What we want to know is the length at the 7-th percentile and at the 93-rd percentile.

According to a z-score table, the 7-th percentile has a correspondent z-score of -1.476 and the 93-rd percentile has a z-score of 1.476. Therefore, the bottom 7% and top 7% are separated by the following lengths:

$z(X_B)=\frac{X_B-\mu}{\sigma}\\-1.476=\frac{X_B-6.13}{0.06}\\X_B = 6.04\\z(X_T)=\frac{X_T-\mu}{\sigma}\\1.476=\frac{X_T-6.13}{0.06}\\X_T = 6.22$

Bottom 7%: L= 6.04 cm.

Top 7%: L= 6.22 cm.

7 0

2 years ago