Step-by-step explanation:
a the rate of changes = (185-146)/30
= 1.3° /minutes.
after 45 minutes = 1.3 ×45 = 58.5°
so, the temperature = 185 - 58.5
= 126.50°F
b. the time to reach 100°F =
(185-100)/ (1.3)
= 85/(1.3) = 65.38
after 65.38 minutes
Step-by-step explanation:
a) ( 2x+y) + 3y ( y-z) -2x ( x-y )
↪ (2× -1 + 1) + 3 × 1 (1 - 2) - 2 × -1 (-1 -1)
↪ -1 + 3 × -1 × - 2 × -1 × -2
↪ -1 + 12 = 11 , answer
b) ( x-2y) ( 3x² + 4xy - y²)
↪ (-1 - 2 × 1) (3 × -1² + 4 × -1 × 1 - 1²)
↪ -3 × (- 3 - 1 - 4 - 1)
↪ -3 × -9
↪ 27, answer
c) ( x³ + y³ - z³) ( 2x + y -z)
↪ (-1³ + 1³ - 2³) (2 × -1 + 1 × -2³)
↪ (-1 + 1 - 8) (-2 - 8)
↪ -8 × -10 = 80, answer
- 1 <= sin (a) <= 1
-2+5*(-1)<= -2+5sin(pi/12)(x-2)<= -2 +5*(1)
so
the minimum value of y is
y = - 2 + 5 * ( - 1 ) = - 7
hope this would help you
It should be B.
2x-x+3 = 8
x = 5
plug into second equation
y=5-3
y=2
(5,2)