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alexandr1967 [171]
3 years ago
15

Help plz with Algebra question I attached a file

Mathematics
1 answer:
astraxan [27]3 years ago
5 0

Answer:

x=4.63

Step-by-step explanation:

Area = (1/2) (base) (height)

20 = (1/2) (x+4) (x)

40 = x²+4x

x²+4x-40=0

Put in quadratic equation:

x=\frac{-4(+/-)\sqrt{4^{2}-4(1)(-40) } }{2(1)}

x=\frac{-4(+/-)\sqrt{176} }{2}

x=4.63324958071 or x=-8.63324958071

Since x can't be negative in this case we take our answer to be 4.63324958071, which rounds to 4.63

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5 0
3 years ago
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please help :) Which number is less than 2.167 × 10 to the 4 power? A. 9,978 B. 1.1 x 10 to the 6 power C. 56,344,000 D. 2.468 ×
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Answer: A

Step-by-step explanation

2.167x10^4 = 21,670

                   = 9,978

1.1x10^6      = 1100,000

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2.468x10^5 =  246,800

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3 years ago
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14) The height, h metres, of a ball projected directly upwards from the ground can be modelled by h = 56t - 71, where t is the t
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6 0
3 years ago
A car dealership decreased the price of a certain car by 4% . The original price was $43,600 . write the new price in terms of t
defon

Answer: The new price of  the car is $41856

Step-by-step explanation:

So we know the the original price as 43,600 which is 100% and is being dropped by 4%  so you would have to subtract 4% from a 100% and multiply it by the original price.

100% - 4% = 96%

Now 96% of the original price is the new price.

96% * 43,600= ?

0.96 * 43,600 = 41856

6 0
3 years ago
The probability that a customer selects a pizza with mushrooms or pepperoni is , and the probability that the customer selects o
Andrej [43]

Answer:

The probability of the customer selecting both items is 0.04.

Step-by-step explanation:

The complete question is:

The probability that a customer selects a pizza with mushrooms or pepperoni is 0.45, and the probability that the customer selects only mushrooms is 0.32. If the probability that he or she selects only pepperoni is 0.17, find the probability of the customer selecting both items.

Solution:

The information provided is as follows:

P (M) = 0.32

P (P) = 0.17

P (M ∪ P) = 0.45

Compute the probability of the customer selecting both items as follows:

P(M\cup P)=P(M)+P(P)-P(M\cap P)\\\\P(M\cap P)=P(M)+P(P)-P(M\cup P)\\\\=0.32+0.17-0.45\\\\=0.04

Thus, the probability of the customer selecting both items is 0.04.

6 0
3 years ago
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