Help plz thx I'm new here

Answers

Answer 1

Answer: 3. 20-(5x2). The answer is 10. [20-(5x2) -> 20-10=10]
4. B (Parenthesis are needed) and C (Start with simplifying the bottom).
5. 6x(9-3). The answer is 36. [6x(9-3) -> 6x6=36]
6. 10 divided by the difference of 6 and 4.
7. B
8. (5+7)x3 -> 12x3=36

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How can I solve this system of linear equations by substitution 3x-2y=9 and y=2x-7

Answers

y=2x-7
therfor we can SUBSITUTE 2x-7 for y whereever we see y in the other equation

3x-2(2x-7)=9
3x-4x+14=9
-x+14=9
minus 14 both sides
-x=-5
mulitly -1
x=5

sub back

y=2x-7
y=2(5)-7
y=10-7
y=3

(5,3)

Max has 5 red model cars. One third of his model cars are red. How many model cars does Max have?

Answers

5=red
1/3 of all=red
1/3 of all=5
3/3 of all=all=1/3 times 3/1=5 times 3/1=15

15 total

If you would like to know how many model cars does Max have, you can calculate this using the following steps:

1/3 of x equals to 5
1/3 * x = 5 /*3
x = 5 * 3
x = 15 model cars

Result: Max has 15 model cars.

Line L is perpendicular to chord AB which statement is true

Answers

Answer:

$\bar {AQ} =\bar {QB}$

Step-by-step explanation:

Since line L passes through the center of the circle and it is perpendicular to chord AB, it bisects chord AB.

This means that L is the locus of points equidistant from A and B.

This also means that Q is the midpoint of AB.

Hence the correct answer is $\bar {AQ} =\bar {QB}$

Is it possible to cut a rectangular prism so that its cross section is a circle orman ellipse?

Answers

No. A rectangular prism's "cross section" would never be a circle or an ellipse. It could be a triangle, a square and a rectangle but not a circle or ellipse.

A miniature horse weighs 228 fewer kilograms than a shetland pony. Miniature horse weighs 53kg

Answers

Then that means the Shetland pony weighs 175 kilograms
because 228-53 is 175

228 - 53 = 175

Since the answer to 228-53 is 175 the Shetland pony weighs 175 kg.

Hope i helped!

if a plane can travel 490 miles per hour with the wind and 450 miles per hour against the wind, find the speed of the plane without a wind and the speed of the wind.

Answers

s=plane's speed
w=windspeed

travels490 mh with wind
450 agains wind

s+w=490mph
s-w=450
add them toegether

s+w=490
s-w=450 +
2s+0w=940

2s=940
divide by 2
s=470
find wind speed
s+w=490
470+w=490
w=20

windspeed=20mph
planespeed=470mph

The accurate answer will be 470mi/hour