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gitokw
17.07.2019 •
Mathematics
Me solve the system of equations. y=x+6 y=x^2 + 8x +16 enter your answers in the boxes as ordered pairs.
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Ответ:
since both answers = y then you put them equal to each other and then solved for x.
x+6=x^2 +8x +16
0=x^2 +7x +10
0=(x+2)(x+5)
x=-2 or -5
and for y I input the two separately into one of the equations
y= (-2)+6
y=4
y=(-5)+6
y=1
and then I double checked by imputing my y's and x's into the remaining equation.
(4)=(-2)^2 +8(-2)+16
4=4-16+16
4=4
(1)=(-5)^2 +8(-5)+16
1=25-40+16
1=1
I hope your tests go well with the help of this knowledge.
Ответ:
Here BD & AB represent the string.
Now in triangle DBC, CD is opposite to 25° and BD = 50 is the hypotenuse.
The trigonometry ratio associating opposite and hypotenuse is sin.
So we have
Multiplying by 50 on both sides
CD = 50 × sin 25°
CD = 21.13 feet
Now in triangle ABC, BC = opposite and AB =50 is hypotenuse with respect to 45°.
So we have
Multiplying by 50 on both sides
AC = 50 × sin45°
AC = 35.36 feet
Hence the kite moves up by = 35.36-21.13 = 14.23 feet.
The approximate difference in the height of the kite is 14.2 feet
Option a) is the right answer.