Ask question

Ask question

All categories

3 years ago

7

two mechanic worked on a car. the first mechanic worked for 19 hours, and the second mechanic worked for 15 hours. together they

charged a total of $2550. what was the rate charged per hour by each mechanic if the sim of the two rates was $205 per hour?

1 answer:

Georgia [21]3 years ago

4 0

Answer:

d

Step-by-step explanation:

You might be interested in

Arrange the parabolas represented by the equations in increasing order with respect to the y-values of their directrixes.

Alexus [3.1K]

(x-h)^2=4P(y-k), vertex is (h,k)
P is distance from vertex to directix
remember to subtract P from the y value of the vertex (p-k) and that y value is the directix, y=p-k

nut
ok so one way is to just graph them on a graphing utility
remember if the graph opens up, then the directix is below that
or we can convert to 4P(y-k)=(x-h)^2 form where P is distance from directix

I will only convert the 1st one fully, you should be able to do the rest

1. y=-x^2+3x+8
multiply both sides by -1 since we don't like the x^2 term negative
-y=x^2-3x-8
add8 to both sides
-y+8=x^2-3x
take 1/2 of linear coeficient and square it and add to both sides
-3/2=-1.5
(-1.5)^2=2.25
-y+10.25=x^2-3x+2.25
factor perfect square
-y+10.25=(x-1.5)^2
force undistribute -1 in left side
(-1)(y-10.25)=something, we don't care anymore for now
factor out a 4 in -1
4(-1/4)(y-10.25)

k=10.25
p=-1/4=-0.25
directix=k-p=10.25-(-0.25)=10.5
directix is y=10.5

basically completee the square with x and find P by force factoring a 4 out

2. directix: y=-1.75

3. directix: y=1.5

4. directix: y=17.25

5. d: -37.5

6. d: 9.25

7. d=2.625

order them yourself

7 0

2 years ago

Complete the comparison: 3 + 7 > ? A. 8 + 2 B. 10 − 2 C. 7 + 3 D. 9 + 4

Dafna1 [17]

3 + 7 > 10 - 2
10 > 8...correct

5 0

3 years ago

Describe the solutions of each inequality in words:<br><br> 2m ≥ 6

Semenov [28]

Answer:

Step-by-step explanation:

Dame tu cosita ah ah

Dame tu cosita ah, ay

Dame tu cosita ah ah

Dame tu cosita ah, ay

Dame tu cosita ah ah

Dame tu cosita ah, ay

Dame tu cosita ah ah

Muévete para aquí, muévete para allá

Dame tu cosita (ay toma, cosita, cosita, cosita)

Dame tu cosita (ay toma, cosita, pure energy)

Dame tu cosita (ay toma, cosita, cosita, cosita)

Dame tu cosita (ay toma, cosita, cosita, cosita)

Dame tu cosita ah ah

Dame tu cosita ah, ay

Dame tu cosita ah ah

Dame tu cosita ah, ay

Dame tu cosita ah ah

Dame tu cosita ah, ay

Dame tu cosita ah ah

Muévete para aquí, muévete para allá

Dame tu cosita (ay toma, cosita, cosita, cosita)

Dame tu cosita (ay toma, cosita, pure energy)

Dame tu cosita (ay toma, cosita, cosita, cosita)

Dame tu cosita (ay toma, cosita, cosita, cosita)

8 0

3 years ago

olga55 [171]

Answer:

=5

Step-by-step explanation:

-7-6(-2)

-7+12

=5

sorry didn't read it right

4 0

3 years ago

What's the surface area?<br> (EXPLAIN YOUR ANSWER)

cestrela7 [59]

The least common multiple (LCM) of two or more non-zero whole numbers is the smallest whole number that is divisible by each of those numbers. In other words, the LCM is the smallest number that all of the numbers divide into evenly.

57960ft

5 0

3 years ago