Answer:
x=4.875
y=-0.25
Step-by-step explanation:
4x – 2y = 10
2x-y=10
y=2x-10
4x + 6y = 18
2x+3(2x-10)=9
8x=39
x=4.875
y=2(4.875)-10
y=-0.25
First Division, next Addition and Subtraction (left-to-right)
4 + 8 : 2 - 1 = 4 + 4 - 1 = 8 - 1 = 7
<h3>Answer: b. 7</h3>
Answer:
b=2
Step-by-step explanation:
we have
9x+12y=21 -----> equation A
6x+8y=7b ----> equation B
we know that
If the system of equations have an infinite number of solutions then the equation A must be equal to the equation B
Multiply equation B by 1.5 both sides
1.5*[6x+8y[=7b*1.5
9x+12y=10.5b ----> equation C
Compare equation A and equation C
9x+12y=21 -----> equation A
9x+12y=10.5b ----> equation C
For the equations to be equal it must be fulfilled that
21=10.5b
solve for b
b=21/10.5
b=2
Answer:False
Step-by-step explanation: negative exponents increase the decimal. So 10^-1=0.1
Answer:
a) 49%
b) 49
Step-by-step explanation:
We have that:
The proportion of adult women in a certain geographical region is approximately 49%.
a) What proportion of women in the sample of 100100 would you expect to see?
The same as the region, that is 49%.
b) How many women, on average, would you expect to find in a sample of that size?
There are 100 people. In the region, the proportion of women is 49%.
So, in a sample of 100 people, you would expect to find 49 women.
