1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Gnom [1K]
3 years ago
7

The quadratic function y = -x2 + 10x - 8 models the height of a trestle on a bridge. The x-axis represents ground level. To find

where the section of the bridge meets ground level, solve 0 = -x2 + 10x - 8. Where does this section of the bridge meet ground level? Choose an equation that would be used to solve 0 = -x2 + 10x – 8 (x + 25)2 = –8 (x – 5)2 = 17 (x – 10)2 = 25 Solve the equation to find where the trestle meets ground level. Enter your answers from least to greatest and round to the nearest tenth. The trestle meets the ground at units and units.
Mathematics
2 answers:
ss7ja [257]3 years ago
5 0

Answer:

The trestle meets ground level at 0.9 units and 9.1 units

Step-by-step explanation:

∵ -x² + 10x - 8 = 0 ⇒ × (-1)

∴ x² - 10x + 8 = 0

∵ 10x/2 = 5x ⇒ (x) × (5) ⇒ square x is x² and square 5 is 25

By using completing square form

∴ (x² - 10x + 25) - 25 + 8 = 0

∴ (x - 5)² - 17 = 0

∴ (x - 5)² = 17 ⇒ take square root for both sides

∴ x - 5 = -√17 ⇒ x = -√17 + 5 = 0.9

∴ x - 5 = √17 ⇒ x = √17 + 5 = 9.1

∴ The trestle meets ground level at x = 0.9 and x = 9.1

Margarita [4]3 years ago
5 0

Answer:

The trestle meets ground level at 0.9 units and 9.1 units

Step-by-step explanation:

You might be interested in
I need helppppppp.....
RoseWind [281]

Answer:

6/7

Step-by-step explanation:

-3 - 4         -7         -7

---------- =  -------- = ------

5 - (-1)      5 + 1        6

Do the inverse of -7/6: 6/7

4 0
3 years ago
Christine went shopping and bought each of her ten nephews a gift, either a video costing $14.95 or a cd costing $16.88. she spe
JulsSmile [24]
She got 9 videos, and 1 cd.
7 0
3 years ago
Rewrite the radical expression as an expression with a rational exponent. the seventh root of x to the third power
kherson [118]

The expression with a rational exponent of the seventh root of x to the third power is x to the three sevenths power ⇒ answer A

Step-by-step explanation:

Let us explain how to change the radical expression as an expression

with a rational exponent

1. Find the number of the root and make it the denominator of the

  fraction exponent

2. Find the power of the term under the radical and make it the

   numerator of the fraction exponent

Examples:

\sqrt{x^{n}}=x^{\frac{n}{2}}

\sqrt[3]{x^{n}}=x^{\frac{n}{3}}

\sqrt[5]{x^{n}}=x^{\frac{n}{5}}

So \sqrt[m]{x^{n}}=x^{\frac{n}{m}}

∵ the radical expression is the seventh root of x to the third power

∵ seventh root = \sqrt[7]{}

∵ x to the third power = x³

∴ seventh root of x to the third power = \sqrt[7]{x^{3}}

Let us change it to the rational exponent

∵ \sqrt[m]{x^{n}}=x^{\frac{n}{m}}

∵ \sqrt[7]{x^{3}}

∴ m = 7 and n = 3

∴ \sqrt[7]{x^{3}} = x^{\frac{3}{7}}

∵ x^{\frac{3}{7}} is x to the three sevenths power

∴ \sqrt[7]{x^{3}} is x to the three sevenths power

The expression with a rational exponent of the seventh root of x to the third power is x to the three sevenths power

Learn more:

You can learn more about radical equation is brainly.com/question/7153188

#LearnwithBrainly

4 0
4 years ago
Read 2 more answers
Please help me answer this show work plz
AleksAgata [21]
14 x 2000
Basic multiplication fact:
14  x   2=28
Total number of zeros=3
So, 14 x 2000=28,000
6 0
3 years ago
Read 2 more answers
Marty bought 4 new books today. he plans to read 2 of these while on vacation. how many combinations of 2 books from the group o
Grace [21]
6 :)

no. of books: 1 2 3 4
combinations: 12, 13, 14, 23, 24, and 34
8 0
3 years ago
Other questions:
  • During a thunderstorm​ yesterday, 600 millimeters of rain fell in 30 minutes. What is the unit rate for millimeters per​ minute?
    15·2 answers
  • sara has two bags of nuts one with 60% peanuts and the other with 28% peanuts. to make a ten pound bag of 45% peanuts how much o
    6·1 answer
  • What are the factors of 315000?
    10·1 answer
  • Help me please thank you
    5·2 answers
  • Twenty-four percent of the 25 swim team members are new on the team. how many members are new?
    7·2 answers
  • Mario has a remaining balance of $1,300 on his credit card. His credit card has an APR of 20 percent. How much will he pay in in
    15·1 answer
  • What is 11/40 in simplest form
    5·1 answer
  • If f(x) = 7+ 4x and g(x) = 1/2,
    9·1 answer
  • Please answer, thank you. Image below.
    10·1 answer
  • Find the slope of the line y=1/6x+3/2
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!