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2 years ago

Hello pls help me with two of these questions;)

Mathematics

1 answer:

Yuliya22 [10]2 years ago

3 0

Answer:

1-A-15

2-C

Step-by-step explanation:

7-21 is an increase by 3 times, so 5*3=15

The second is kinda blurry, so it's a little hard to explain.

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0.5 divided by 786 times 4/5=

Fofino [41]

Answer:5.088

.5÷786=6.36

6.36×0.8=5.088

I hope this is good enough:

6 0

2 years ago

There are 88 Keyes on a piano.some keys are black and some keys are white .

shepuryov [24]

It would be C.88-x and there are 36 black keys on an 88 key piano

5 0

3 years ago

Read 2 more answers

Which of the following is a solution to the equation "y=3x-1"

nalin [4]

we have

$y=3x-1$

we know that

If the point is an equation solution, it must satisfy the equation.

case a) $(4,1)$

Substitute the values of x and y in the equation

$1=3*4-1$

$1=12-1$

$1\neq11$ -------> the point is not solution of the equation

case b) $(2,5)$

Substitute the values of x and y in the equation

$5=3*2-1$

$5=6-1$

$5=5$ -------> the point is solution of the equation

case c) $(4,3)$

Substitute the values of x and y in the equation

$3=3*4-1$

$3=12-1$

$3\neq11$ -------> the point is not solution of the equation

case d) $(0,-3)$

Substitute the values of x and y in the equation

$-3=3*0-1$

$-3\neq-1$ -------> the point is not solution of the equation

therefore

the answer is

The point $(2,5)$ is solution of the equation

4 0

2 years ago

Read 2 more answers

Pleaseeee help eoth #7

bulgar [2K]

1 is the given at the top of the question and the reasoning is bec it’s given

3 0

2 years ago

Read 2 more answers

I am so confused. not sure how to solve need step by step instruction to help please

sladkih [1.3K]

Answer:

Step-by-step explanation:

Since -5 is less than zero, we use the second equation, and substitute the -5 in for the x.

-2(-5)+3=13

7 0

2 years ago