What percentage of 70 is 2.5?

Mathematics

1 answer:

drek231 [11]3 years ago

7 0

1.5 would be the answer I think

You might be interested in

9.<br> Which of these is equal to {2 - 31}{21 +4}?

densk [106]

Answer:

-725

Step-by-step explanation:

5 0

2 years ago

LOOK AT THE PICTURE!! I REALLY NEED HELP SOMEONE PLEASE HELP ME OUT

uysha [10]

Answer: B

Step-by-step explanation: Hope this help :D

8 0

2 years ago

I am having issues with this problem in math: 27x+33x-65x=y

Gekata [30.6K]

Answer:

Step-by-step explanation:

the answer would be -5x

6 0

2 years ago

How would i solve for x and y in 3x+2y=17 and 2x-y=2 by using substitution

maxonik [38]

I’ll do an example problem, and I challenge you to do this on your own!
4x+6y=23
7y-8x=5
Solving for y in 4x+6y=23, we can separate the y by subtracting both sides by 4x (addition property of equality), resulting in 6y=23-4x. To make the y separate from everything else, we divide by 6, resulting in (23-4x)/6=y. To solve for x, we can do something similar - subtract 6y from both sides to get 23-6y=4x. Next, divide both sides by 4 to get (23-6y)/4=x.

Since we know that (23-4x)/6=y, we can plug that into 7y-8x=5, resulting in
7*(23-4x)/6-8x=5
= (161-28x)/6-8x
Multiplying both sides by 6, we get 161-28x-48x=30
= 161-76x
Subtracting 161 from both sides, we get -131=-76x. Next, we can divide both sides by -76 to separate the x and get x=131/76. Plugging that into 4x+6y=23, we get 4(131/76)+6y=23. Subtracting 4(131/76) from both sides, we get
6y=23-524/76. Lastly, we can divide both sides by 6 to get y=(23-524/76)/6

Good luck, and feel free to ask any questions!

4 0

3 years ago

Given x^2 + y^2 = 36 and xy = -10 find x + y.

9966 [12]

This looks fun

ok so
we will use subsitution
xy=-10
divide both sides by x or y (I will choose y)
x=-10/y

sub -10/y fo x

(-10/y)^2+y^2=36
100/(y^2)+y^2=36
times both sides by y^2
100+y^4=36y^2
minus 36y^2 from both sides
y^4-36y^2+100=0
(y^2)^2-36(y^2)+100=0
quadratic formula
for
ax^2+bx+c=0
x= $\frac{-b+/- \sqrt{b^2-4ac} }{2a}$
x= $\frac{-(-36)+/- \sqrt{(-36)^2-4(1)(100)} }{2(1)}$
x= $18+/- 4\sqrt{14}$

sub
y=-10/x
y= $\frac{-10}{18+/- 4\sqrt{14}}$

so x+y= $18+/- 4\sqrt{14}$ + $\frac{-10}{18+/- 4\sqrt{14}}$
multiply first number by $\frac{18+/- 4\sqrt{14}}{18+/- 4\sqrt{14}}$ and add them

x+y= $\frac{(18+/- 4\sqrt{14})(18+/- 4\sqrt{14})-10}{18+/- 4\sqrt{14}}$
or
x+y= $\frac{81+22 \sqrt{14} }{5}$ or $\frac{81-22 \sqrt{14} }{5}$

8 0

2 years ago

What percentage of 70 is 2.5?​

What percentage of 70 is 2.5?