5x + 2y = 13
x + 2y = 9
Subtract :- ( note that 2y - 2y = 0):-
4x + 0 = 4
x = 1
From 2nd equation plug in x = 1
1 + 2y = 9
2y = 8
y = 4
Solution to this equation is x=1,y=4
2x + y = 7
5x - y = 14
Adding eliminates the y terms because y + -y = 0 :-
7x + 0 = 21
7x = 21
x = 3
Plug x=3 into second equation:-
5(3) - y = 14
y = 15-14 = 1
solution is x =3, y = 1
Answer:
Step-by-step explanation:
For the null hypothesis,
p = 0.35
For the alternative hypothesis,
P > 0.35
Since the z score is given as z = 1.82, we would find the probability value by determining the area above the z score from the normal distribution table. The required probability value is
1 - 0.966 = 0.034
Assuming alpha = 0.05,
Since alpha, 0.05 > than the p value, 0.034, then we would reject the null hypothesis. Therefore, the correct option is
At significance level of 5%,
There is enough evidence to show that more than 35% of community college students own a smart phone (P-value = 0.034).
Answer:
The answer would be 19
Step-by-step explanation:
You plug in the x and y values, and it looks like this
2(4)^2/8+5(3)
Simplify
2(16)/8+15
32/8+15
4+15
--->19<---
Answer:
Yeah!!!you're right, it's -7
Step-by-step explanation:
-2c -5c+8-4 = 53
-7c +4 = 53
-7c = 53 - 4
-7c = 49
c = -7
<span>1. The problem says that the is ratio 1:3:5 by weight and Talil wants to make 180 kg of concrete mix.
2. Therefore, you have:
1+3+5=9
180 kg/9=20 kg
3. Each of the 9 parts of the ratio weights 20 kg. So, to make 180 kg of concrete mix, he needs:
1x20 kg=20 kg of cement
3x20 kg=60 kg of sand
5x20 kg=100 kg of gravel
4. Talil has:
15kg of cement (Not enough)
85kg of sand (More than enough)
100kg of gravel (Enough)
</span><span>
Does Talil have enough cement , sand and gravel to make concrete mix?
</span><span>
The answer is: No, she does no have </span>enough cement , sand and gravel to make concrete mix.
