Step-by-step explanation:
h = -490t² + 1470t
When h = 980:
980 = -490t² + 1470t
Simplifying:
0 = -490t² + 1470t - 980
0 = t² - 3t + 2
Factoring:
0 = (t - 1) (t - 2)
t = 1, 2
There are two solutions because the rocket first reaches the height of 980 cm as it's going up at 1 second, then it reaches that height again as it's coming down at 2 seconds.
Answer:
2.75
Step-by-step explanation:
275% = 2.75 in decimal form. Percent means 'per 100'. So, 275% means 275 per 100 or simply 275/100. If you divide 275 by 100, you'll get 2.75 (a decimal number)
<span>You are given
the factors 12.34.0.74.91. The dots between the factors mean ‘to multiply’. Multiplying
12 by 34 by 0 by 74 by 91 would result to zero. The product of the given
numbers is 0. This is due to the zero property of multiplication. Any number
multiplied by zero is equal to zero. No matter how long the number you are
going to multiply it, if there is a zero between the factors, the answer will
always be zero.</span>
Answer:
y = 5x + 3 is a nonproportional relationship.
Step-by-step explanation:
We need to find the equation that represents a nonproportional relationship.
If y is directly proportional to x, it would mean that,
y ∝ x
y = kx
Option (b) shows the equation of a line i.e. y=mx+x, where m is slope and x is y-intercept.
Hence, we can say that option (b) represents a nonproportional relationship.
Answer:
382000
Step-by-step explanation: