3 years ago

If mark got 6 questions out of 40 incorrect what percent of the questions did he get correct?

1 answer:

7 0

So if 6 out of 40 are incorrect, 40-6= 36 must be correct.
In order to gain percentage you do proportions.
36/40 = x/100.
Multiply 36 times 100 then divide by 40, which is 90.
The answer is 90%.
90% of the questions he got were correct.

You might be interested in

What are the coordinates of the vertex of the parabola described by the

Ksju [112]

Answer: D. ( -7, - 2 )

Step-by-step explanation:

Rewrite this in vertex form and use this to find the vertex. ( h, k )

8 0

2 years ago

Read 2 more answers

I have a problem -3x-7=-13. When isolating x I divide x by -3 then divide -13 by -3 correct?

rosijanka [135]

Hello!

no, that is not the correct way to isolate x. you were somewhat on the right track however.

here's the correct way:

add 7 to both sides to get -3x = -6

then divide both sides by -3 to get x = 2

I hope this helps, and have a nice day!

6 0

3 years ago

If F (7) 22, Then F(f-1(22))

jeka57 [31]

Answer:

$\boxed{\boxed{f(f^{-1}(22))=22}}$

Step-by-step explanation:

$\text{If we have}\ f(x)\ \text{and}\ f^{-1}(x),\ \text{then}\\\\\text{if}\ f(a)=b,\ \text{then}\ f^{-1}(b)=a.\\\\\text{Therefore, if}\ f(7)=22,\ \text{then}\ f^{-1}(22)=7.\\\\f(\underbrace{f^{-1}(22)}_{=7})=f(7)=22$

6 0

3 years ago

2(3x + x)<br> Simplify the following expression and what are the like terms

AleksandrR [38]

Answer: 8x

Step-by-step explanation:

2(3x + x)

2(4x)

Hope this helps.

7 0

3 years ago

Find ratio of 13cm : 65m

vesna_86 [32]

Answer:

1:5

Step-by-step explanation:

13cm: 65cm = 13cm/65cm =13/65 = 1/5= 1:5

6 0

2 years ago