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
Juli2301 [7.4K]
4 years ago
13

Alba worked for 6 hr 45 min at $7.90 per hour. What numbers could she use to estimate how much money she earned? Estimate the am

ount she earned, and the state whether you think the exact amount is a little more or a little less than your estimate.
Mathematics
1 answer:
Svetradugi [14.3K]4 years ago
8 0

Answer:

  • $52
  • this estimate is a little low

Explanation:

a) I might choose 6 1/2 hours and $8 per hour, so the estimated earnings would be ...

  6(8) +(1/2)(8) = 52 dollars . . . . estimated earnings

These values are purposely chosen so that one is a little high and the other is a little low, hopefully producing a closer estimate than if both numbers were high (as 7 hours, $8, for example).

__

b) Using 800 instead of 790 means the pay estimate is about 1/80 = 1.25% high.

Using 6 1/2 instead of 6 3/4 means the hours estimate is about 1/27 ≈ 3.7% low.

So, we expect the product of these values to be slightly low, perhaps by about 2.5%.

_____

<em>Comment on estimating</em>

If you can estimate the error in the estimate with some reasonable accuracy, you can use that to adjust the estimate to a pretty close value.

You might be interested in
Y= -3/4x + 9<br> please help me with my homework
Inga [223]
X=12
Substitute y with 0
Multiply both sides
0=-3/4x+9
0=-3x+36
3x=36
Divide by 3
It’s 12
5 0
3 years ago
If you could please help
FinnZ [79.3K]

Answer:

SA =588 m^2

Step-by-step explanation:

SA = 4 pi r^2

R = 7 and pi =3

SA = 4*3 * 7^2

SA =588 m^2

6 0
3 years ago
The sum of the areas of two circles is 80 pi
katovenus [111]
The area of a circle is A = πr^2. We let A1 And A2 the areas of the circles and r1 and r2 the radius of each, respectivley.

A1 + A2 = 80π
Substitute the formula for the area,
π(r1)^2 + π (r2)^2 = 80π

From the statement, we know that r2=2(r1).

<span>π(r1)^2 + π (2 x r1)^2 = 80π
</span>We can cancel π, we will have

5 x (r1)^2 = 80
Thus,

r1 = 4 and r2 = 8
5 0
3 years ago
Find anequation for the perpendicular bisector of the line segment whose endpoints are(3, -1) and (-9,5).
Mariulka [41]

The perpendicular bisector goes through the midpoint.

What is the midpoint of the 2 points?

We simply add up the x points and divide by 2. Then we add up the y points and divide by 2.

So,

Midpoint is:

(\frac{3-9}{2},\frac{-1+5}{2})=(-3,2)

Also, the perpendicular bisector's slope is the negative reciprocal of the line's slope.

The slope of the line is change in y points divided by change in x points.

Slope =

\frac{5--1}{-9-3}=\frac{5+1}{-12}=\frac{6}{-12}=-\frac{1}{2}

The slope (m) of the perpendicular line (negative reciprocal) is basically:

2

Equation of line is:

y-y_1=m(x-x_1)

m is the slope (what we got "2")

x1 and y1 are the respective point where it passes through (which is the midpoint, which is (-3,2)

So, equation of perpendicular bisector is:

\begin{gathered} y-y_1=m(x-x_1) \\ y-2=2(x+3) \\ y=2x+6+2 \\ y=2x+8 \end{gathered}

4 0
1 year ago
H(t)=t^2+4t+3 what are the zeroes of the function? Write the smaller t first, and then the larger t second
Anuta_ua [19.1K]

Answer:

t = - 3, t = - 1

Step-by-step explanation:

Given

h(t) = t² + 4t + 3

To find the zeros equate h(t) to zero, that is

t² + 4t + 3 = 0

Consider the factors of the constant term (+ 3) which sum to give the coefficient of the t- term

The factors are + 3 and + 1, since

3 × 1 = 3 and 3 + 1 = 4, thus

t² + 4t + 3 = (t + 3)(t + 1) = 0

Equate each factor to 0 and solve for t

t + 3 = 0 ⇒ t = - 3

t + 1 = 0 ⇒ t = - 1

smaller zero is t = - 3

larger zero is t = - 1

5 0
3 years ago
Other questions:
  • the function g(t) = 2t represents the number of guitar lessons, g(t), you can complete in t months. how many guitar lessons can
    14·1 answer
  • In Melanie's Styling Salon, the time to complete a simple haircut is normally distributed with a mean of 25 minutes and a standa
    14·1 answer
  • Which financial item transfers risk from one party to another?
    5·1 answer
  • The length of the longer side of rectangle $r$ is $10$ percent more than the length of a side of square $s.$ the length of the s
    11·1 answer
  • The base of a pyramid is the regular polygon shown below.
    7·2 answers
  • What is five hundred six and twelve hundredths in standard form
    7·1 answer
  • It also detects if you are right or wrong
    14·2 answers
  • Doug is playing a game. He gets p points for green cards, 2p points for yellow cards, and 3p points for wild cards. He has 16 gr
    12·1 answer
  • A. Explain why a system that consists of a linear equation and a quadratic equation can have zero, one, or two solutions.​
    7·1 answer
  • What is the slope of the line?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!