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
Mkey [24]
3 years ago
7

5) If f(x)=x2-x, what is f(-5)? A. -30 B. -20 C. 20 D. 30

Mathematics
1 answer:
dezoksy [38]3 years ago
7 0
You simply plug it in.

f(x) = x^2 - x
f(-5) = -5^2 - (-5)
f(-5) = -25 - (-5)
f(-5) = -20

hope this was helpful for you.
You might be interested in
Full‐me Ph.D. students receive an average of $12,837 per year. If the
Pavlova-9 [17]

Answer:

.0022

Step-by-step explanation:

6 0
2 years ago
Add 1/2 liter,3/4 liter and 7/8 liter
LUCKY_DIMON [66]
First, find a lowest common denominator. The lcd in this equation os 8 so your new fractions would be 4/8, 6/8, and 7/8. You add the numerators (top numbers), which equals 17/8. Then you simplify to 2 1/8 liters.
5 0
3 years ago
a quadratic equation has a discriminant of 12. which could be the equation? a.0 = –x2 8x 2 b.0 = 2x2 6x 3 c.0 = –x2 4x 1 d.0 = 4
Norma-Jean [14]

Answer:

Option b which is 2x^2+6x+3=0

Step-by-step explanation:

We have been given the discriminant 12

We have to choose the equation which will satisfy the given discriminant.

We will consider all the given equation one by one

First we will take option a which is -x^2+8x+2=0

Discriminant from the equation we will find by the formula

D=b^2-4ac

Here, a=-1,b=8 and c=2 on substituting the values we will get

D=8^2-4(-1)(2)=72

Hence, option a is incorrect.

Now, we will consider option b which is 2x^2+6x+3=0

Here, a=2,b=6 and c=3 on substituting the values we get

D=(6)^2-4(2)(3)=12

Hence, option b is correct

Therefore, option b is the required answer.

8 0
3 years ago
Read 2 more answers
Pete borrowed $400 for 1 year. He paid back a total of $440. What was the interest rate per year?
OleMash [197]

I=PRT/100

1. Make R (rate) subject

R/100= I/PT

2. Substitute and calculate

r/100= i/pt

r/100= 40/400 × 1

(<em>4</em><em>0</em><em> </em><em>i</em><em>s</em><em> </em>from 440-400.<em>T</em><em>h</em><em>e</em><em> </em><em>i</em><em>n</em><em>t</em><em>e</em><em>r</em><em>e</em><em>s</em><em>t</em>)

r/100= 0.1

r/100×100= 0.1×100

r=10% (interest rate per year)

To confirm

I=PRT

I= 400×10/100×1

I= $40 (Interest)

5 0
3 years ago
Read 2 more answers
You are selling raffle tickets to raise money. Each ticket costs $5. Which equation solves for the number of tickets you must se
aleksley [76]

D. 5x = 45 because you are trying to find x, the number of tickets that must be sold to earn $45.

8 0
3 years ago
Other questions:
  • Help please I’ll mark you brainliest! But can you give me an explanation as well :)
    12·1 answer
  • What is the square root of 5
    7·2 answers
  • Please answer this correctly without making mistakes
    10·1 answer
  • What is the solution to the system of equations?
    8·1 answer
  • Help!<br> Ratios and Porportions
    8·1 answer
  • Find the general solution of the given higher-order differential equation. d3u dt3 + d2u dt2 − 2u = 0
    9·1 answer
  • What is the cost price of 600 pens
    7·1 answer
  • My teacher saysni should know this but i dont. 2+2=?
    10·2 answers
  • Choose the data that is quantitative.
    6·2 answers
  • In a class of 28 students, the teacher selects four people at random to participate in a geography contest. What is the probabil
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!