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Ipatiy [6.2K]
3 years ago
14

What is the value of the equation below when a=3 and b=7 a2-2b

Mathematics
1 answer:
Flauer [41]3 years ago
7 0
This equation uses substitution 
a=3 b=7
a2-2b
(3)2-2(7)
5-14
-9
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A pumpkin is launched from the top of a 20 foot tall platform at an initial velocity of 84 feet per second. The height, h, of th
Gennadij [26K]
<h2>Explanation:</h2>

In this problem we have a pumpkin is launched from the top of a 20 foot tall platform at an initial velocity of 84 feet per second. So the height, h, of the pumpkin at time t seconds after the launch can be modeled by the equation:

h(t) = -16t^2 + 84t + 20

So this is the equation of a parabola. The maximum of this parabola occurs at its vertex. So let's find this vertex:

\text{The x-value of the vertex is}: \\ \\ t=-\frac{b}{2a} \\ \\ \\ Where: \\ \\ a=-16 \\ \\ b=84 \\ \\ c=20 \\ \\ \\ t=-\frac{84}{2(-16)} \\ \\ t=-\frac{84}{-32} \\ \\ t=\frac{21}{8}=2.625 \\ \\ h(2.625)=-16(2.625)^2+84(2.625)+20 \\ \\ h(2.625)=-110.25+220.5+20 \\ \\ h(2.625)=130.25m

Finally, the maximum occurs at time 2.625 seconds when the height is 130.25m

8 0
3 years ago
A triangle has sides measuring 5 inches and 8 inches. If x represents the
lord [1]

Answer:

For me,the answer will be A.

im not sure

correct me if im wrong

love ya

6 0
2 years ago
Read 2 more answers
7-8th grade math level
Ne4ueva [31]

Answer: Let me try to figure this out but this is not 7-8 grade math level

Step-by-step explanation:

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2 years ago
The table of values represents a linear function g(x), where x is the number of days that have passed and g(x) is the balance in
mina [271]

Part A: slope is 40

And i don’t know the rest I’m sorry

3 0
3 years ago
What is the equivalent to 4(4a+5)
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Use the distributive property.

4(4a + 5) = 4 * 4a + 4 * 5 = 16a + 20

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3 0
3 years ago
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