9,990 first digit is like 1, then 10, then 100, then 1000 so the fourth digit being 1 goes to 0 when rounding
Answer:
Step-by-step explanation:
1.5ft(12in/ft)(2.54cm/in)=45.72cm
Answer:
28*4/7
Step-by-step explanation:
4/7
the 7 represents the 28. 28 is a multiple of 7.
<u>28</u> * <u>4</u> = <u>112</u> = 16
1 7 7
<u><em>there are 16 girls</em></u>
also we know 4*7=28 so if we count the multiples of 4, there is 4 8 12 and the 4th multiple is 16.
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Answer:
A bird drops a stick to the ground from a height of 80 feet. The equation 0=−16x2+64x+80 gives the number of seconds that have passed when it hits the ground. After about how many seconds did the stick hit the ground?
Step-by-step explanation:
h = -16t^2 + 80 Stick hits the ground when h = 0:
0 = -16t^2 + 80
16t^2 = 80
t^2 = 80/16 = 5
t = POSITIVE root 5 (due to the real world nature of the problem)
t approximately 2.236 seconds.
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Graph is a downward opening parabola with h-intercept of 80, t-intercept(s) of sqrt(5), - sqrt(5)
Symmetric about h-axis, though I would only graph on the right side of the h-axis since
that is where t >= 0.
