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3 years ago

Austin is 69 years younger than Jamie. 3 years ago, Jamie's age was 4 times Austin's age. How old is Austin now?

Mathematics

1 answer:

matrenka [14]3 years ago

4 0

Answer: 26 years old

Step-by-step explanation:

Create an equation with Austin as x and Jamie as x+69 (I just like workin with addition signs more)= 4(x-3)= x+69-3
Simplify the equations --> 4x-12=x+66
Solve the equation: 3x-12=66 --> 3x=78 --> x=26

This is the same as other age problems, just with the extra step of distributing the multiplication.

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A commercial aircraft gets the best fuel efficiency if it operates at a minimum altitude of 29,000 feet and a maximum altitude o

natita [175]

Answer:

$x\geq 29,000$ and $x\leq 41,000$

Step-by-step explanation:

Let

x -----> the altitude of a commercial aircraft

we know that

The expression " A minimum altitude of 29,000 feet" is equal to

$x\geq 29,000$

All real numbers greater than or equal to 29,000 ft

The expression " A maximum altitude of 41,000 feet" is equal to

$x\leq 41,000$

All real numbers less than or equal to 41,000 ft

therefore

The compound inequality is equal to

$x\geq 29,000$ and $x\leq 41,000$

All real numbers greater than or equal to 29,000 ft and less than or equal to 41,000 ft

The solution is the interval ------> [29,000,41,000]

5 0

3 years ago

How do you solve this equation -6x + 7y =13 and -6x +8y =20 using elimination

ohaa [14]

Answer:

x=6,y= 7

Step-by-step explanation:

-6x +7y= 13

-6x+8y=20

-y = -7

divide through by -1

y =7

sub y= 7 in equation 1

then x= 6

8 0

3 years ago

PLEASE HELP ME ASAP<br> what is w<br> 7.5=w/3

-BARSIC- [3]

Step-by-step explanation:

w = 3x 7.5 = 22.5

hope this helps

3 0

3 years ago

43 points, 86 for brainliest! Answer correct!! Be wise! According to the image attached, whats the answer?

Snezhnost [94]

Answer:

$p = 32\: \: in$

$a = 49 {in}^{2}$

Step-by-step explanation:

$perimeter \\ = 8 + 8+8+8 \\ = 32 \: \: in$

$area \\ 1)3 \times 8 = 24 \\ 2)5 \times 5 = 25 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 49 {in}^{2}$

hope this helps

brainliest appreciated

good luck! have a nice day!

6 0

3 years ago

Read 2 more answers

If the following is a monomial, write it in standard form.

Sati [7]

Answer:

Monomial; Standard form: 18a^2b^2

Step-by-step explanation:

$6 {a}^{2} 3 {b}^{2} = 6 \times 3 {a}^{2} {b}^{2} = 18{a}^{2} {b}^{2} \\$

8 0

3 years ago