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2 years ago

Please solve these step-by-step!!

Mathematics

1 answer:

Ierofanga [76]2 years ago

3 0

Answer:

For D. X= 3, or 0 but probably not 0

For the 2nd picture you sent, x= -2, or -3

Step-by-step explanation:

So for D. you want to make sure you only have 1 Variable, and since we know y=x squared + 7x+5, we subsitute y for what it is equal to.

Then we refine the question, which takes it out to

x squared-3x+5=5 (because the 7x-10x = 3x)

We subtract 5 from both sides which leaves us with x Squared - 3x= 0

Which we then solve with the Quadratic formula. and we separate the solutions to get the different answers for 3, and 0

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Harlamova29_29 [7]

Answer:

x = 5 pens

y = 7 pencils

Step-by-step explanation:

let

x = the number of pens

y = the number of pencils

Anthony spent $2.80 to buy a total of 12 pens and pencils

0.35x + 0.15y = 2.80

x + y = 12

by solving the system of equations

0.35x + 0.15y = 2.80

x + y = 12

we find

x = 5 pens

y = 7 pencils

6 0

2 years ago

Nina can type 128 words is 4

Rama09 [41]

Answer:

1920

Step-by-step explanation:

Nina can type 128 words is 4 minutes. At this rate, how many words can Nina type in an hour?

60 divided by 4 is 15

15x128= 1920

4 0

3 years ago

a set of date consists of 225 observations. the lowest value of the data set is 2,403; the highest is

kobusy [5.1K]

Answer:

8 classes

Step-by-step explanation:

Given

$Least = 2403$

$Highest = 11998$

$n = 225$

Required

The number of class

To calculate the number of class, the following must be true

$2^k > n$

Where k is the number of classes

So, we have:

$2^k > 225$

Take logarithm of both sides

$\log(2^k) > \log(225)$

Apply law of logarithm

$k\log(2) > \log(225)$

Divide both sides by log(2)

$k > \frac{\log(225)}{\log(2)}$

$k > 7.8$

Round up to get the least number of classes

$k = 8$

7 0

2 years ago

In this section, you will solve quadratic inequalities and systems of quadratic equations. True False

Tanya [424]

Answer:

True.

Step-by-step explanation:

If the topic of discussion is on algebraic process, then you have to work on inequalities and quadratic equations. I hope this helps!

6 0

3 years ago

The average age of 4 children is 15 yrs . if the ages of their parents are added , their average age is 25 .find the age of thei

WITCHER [35]

The age of the father is 57 years old

<h3>Calculating mean of a population</h3>

Total age = Average age x Population

Average of the four children = 15

Population = 4

Total age of the four children = 15 x 4

Total age of the four children = 60 years

If the parents are added:

Population = 6

Average age = 25

Total age = 25 x 6

Total age = 150 years

Total age of the parents = 150 - 60

Total age of the parents = 110 years

The father is 4 years older than his wife

Let the age of the father be x

The age of the wife = x - 4

x + x - 4 = 110

2x = 114

x = 114/2

x = 57

Therefore, the age of the father is 57 years old

Learn more on The mean of numbers here: brainly.com/question/20118982

#SPJ1

6 0

2 years ago