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DiKsa [7]
3 years ago
13

A family has two cars. The first car has a fuel efficiency of 30 miles per gallon of gas and the second has a fuel efficiency of

40 miles per gallon of gas. During one particular week, the two cars went a combined total of 1800 miles, for a total gas consumption of 50 gallons. How many gallons were consumed by each of the two cars that week?
Mathematics
2 answers:
Anarel [89]3 years ago
8 0
30x+40(50-x)=1800
Solve for x
X=20 for the first car

50-20=30 for the second car
Ugo [173]3 years ago
6 0
One car 40 miles /gallon
other car 30 miles/gallon
..
Total miles = 165
gas used = 45 gallons
...
let first car drive x miles
second car drive y miles
..
x/40 + y/30 = 45
(30x+40y)/30*40 = 45
30x+40y = 45*40*30
30x+40y=54,000
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Please help me with this question!
Alchen [17]

All are correct except C

You need to check: A, B and D

Hope it helps.

7 0
3 years ago
a, b, and c represent three different digits. If you add up all of the six two - digit numbers that can be written with these di
Viefleur [7K]

Answer:

  • 7, 8 and 9

Step-by-step explanation:

<u>Two-digit numbers are:</u>

  • ab, ac, ba, bc, ca, cb

<u>Sum of them is:</u>

  • 10a + b + 10a + c + 10b + a + 10b + c + 10c + a + 10c + b = 528
  • 22a + 22b + 22c = 528
  • a + b + c = 528/22
  • a + b + c = 24

The only option of three different digits with the sum of 24 is 7, 8 and 9

3 0
3 years ago
Read 2 more answers
What is the measure of RST?​
kumpel [21]

Answer:

A. m\angle RST=62^{\circ}

Step-by-step explanation:

We have been given a diagram. We are asked to find the measure of angle RST.

We can see that angle RST is formed by intersecting chords inside the circle, so its measure would be half the sum of intercepted arcs as:

m\angle RST=\frac{\widehat{RT}+\widehat{PQ}}{2}

m\angle RST=\frac{77^{\circ}+47^{\circ}}{2}

m\angle RST=\frac{124^{\circ}}{2}

m\angle RST=62^{\circ}

Therefore, the measure of angle RST is 62 degrees.

6 0
4 years ago
Read 2 more answers
Solve<br> 2x -y =4<br> 5x -2.5y =10
JulijaS [17]
2x-y=4

Therefore: y=2x-4

---------------------------------

5x-10/4(2x-4)=10

5x-5/2(2x-4)=10

5x-5x+10=10

10=10

------------------------

*Problem can't be solved.
5 0
3 years ago
Find the slope of the line that goes through the given points (8,5) (6,7)
vazorg [7]
To find the slope of a line that goes through given points with known coordinates, you divide the subtraction of the y of the second point minus the y of the first point, by the subtraction of the x of the second point minus the x of the first point:
m = (yB-yA) / (xB-xA)

Let A(8,5) and B(6,7).
With yB = 7; yA = 5; xB = 6; xA = 8
m = (7-5) / (6-8)
m = 2/-2
m = -1

So the slope of the line that goes through the given points (8,5) and (6,7) is m = -1.

I've added a pic of the line with both points under the answer.

Hope this Helps! :)

4 0
3 years ago
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