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3 years ago

Number 20 pls I need help with this one

Mathematics

1 answer:

Norma-Jean [14]3 years ago

3 0

He uses 5/8 tanks of gas in one week.

In 5 he will use, 5/8 *5 = 25/8 in 5 weeks
This can be simplified too:
3.125 tanks of gas

The answer is, 25/8 tanks of gas or 3.125 tanks of gas

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Solve 4/5x - 3 3/4x =2 1/2

faust18 [17]

First one subtract 4/5 and 3 3/4 then divide both sides by the number you get from subtracting.

4 0

3 years ago

Solve the equation (linear equation)<br><br> <img src="https://tex.z-dn.net/?f=8%5E%7B2x%2B7%7D%20%3D%20%28%5Cfrac%7B1%7D%7B32%7

Minchanka [31]

Answer: $x=-1$

Step-by-step explanation:

By the negative exponent rule, you have that:

$(\frac{1}{a})^n=a^{-n}$

By the exponents properties, you know that:

$(m^n)^l=m^{(nl)}$

Therefore, you can rewrite the left side of the equation has following:

$(\frac{1}{8})^{-(2x+7)}=(\frac{1}{32})^{3x}$

Descompose 32 and 8 into its prime factors:

$32=2*2*2*2*2=2^5\\8=2*2*2=2^3$

Rewrite:

$(\frac{1}{2^3})^{-(2x+7)}=(\frac{1}{2^5})^{3x}$

Then:

$(\frac{1}{2})^{-3(2x+7)}=(\frac{1}{2})^{5(3x)}$

As the base are equal, then:

$-3(2x+7)=5(3x)$

Solve for x:

$-6x-21=15x\\-21=15x+6x\\-21=21x\\x=-1$

8 0

3 years ago

How do I do this? <br><br>f(a)=4a+5; Find f(2)

Mariana [72]

F(2)=4(2)+5
f(2)=8+5
f(2)=13

6 0

3 years ago

Is theres 10 birds and i shoot 1 how many is there left?

bazaltina [42]

There would be 9 birds left. 10-1=9

3 0

3 years ago

Can some one plz Solve this. 5 - 2x < 7.

kow [346]

Answer:

x > 1

Step-by-step explanation:

5 - 2x < 7

-5 - 5

-2x < 2

/-2 /-2

(dividing by negative switches the sign)

x >- 1

5 0

3 years ago

Read 2 more answers