Answer:
2x + y = -4
Step-by-step explanation:
standard form of equation of straight line is 
ax+by = c
that  is terms containing x and y should be  on LHS and constant term should be  on RHS
______________________________________________
Given equation
y + 1 = - 2x - 3
lets bring -2x on LHS , 
add 2x on lHS and RHS
y + 1  + 2x = - 2x - 3 + 2x
=> y + 1  + 2x = -3
on lHS, 1 is there which constant term lets bring it on RHS
subtract 1 from both sides
y + 1  + 2x  - 1= -3 -1
y + 2x = -4
rearranging it
2x + y = -4  (Answer)
 
        
             
        
        
        
Answer:
450cm²
Step-by-step explanation:
The area of the kite is made up of two pairs of congruent triangles. Find the area of these and add to get the kite's area. (area of triangle = (1/2)(base)height))
2(0.5*15*20)+2(0.5*15*10)
300+150
450
 
        
             
        
        
        
Answer:
The answer is false 
Step-by-step explanation:
In a sample above 30 obs  like this the confidence interval is defined as 
X+- t* (s/sqrt(n)) where X is the mean t the tvalue for a given confidence level, n the size of sample and s standar deviation. 
To find de appropiate value of t we must see the T table where rows are degrees of freedom and columns significance level
The significance is obtained: 
significance = 1 - confidence level = 1 - 0.9 = 0.10
Degrees of freedom (df) for the inteval are 
df = n - 1 = 18 - 1 = 17 
So we must look for the value of a t with 17 values and significance of 0.10 which in t table is 1.740 not 1.746 ( thats the t for 16 df) 
 
        
             
        
        
        
Answer:
16
Step-by-step explanation:
the equation is x = k / y
therefore k = x* y
 k = 2*8
 k= 16