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2 years ago

Please I need help on this

Mathematics

2 answers:

Stolb23 [73]2 years ago

5 0

Answer:

8.4

Step-by-step explanation:

50 ÷ 25 = 2

(2)2 x 7 x 0.3

4 x 2.1

= 8.4

OlgaM077 [116]2 years ago

5 0

Answer:

9.5

Step-by-step explanation:

$(50/25)^2*2+5*0.3\\(2)^2*2+5*0.3\\4*2+5*0.3\\8+1.5\\9.5$

To solve this you need to use PEMDAS (Parentheses, Exponent, Multiplication, Division, Addition, Subtraction).

PEMDAS is the order in which you need to do the problem. First, do the work within the parentheses. Then, do as the exponent require. After that, multiply as stated. After all of this, you add in the end.

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2. A square-based tent has the cross-sectional

ollegr [7]

(a) Length of the height is 2.732 m

(b) Length of the base is 5.466 m

Explanation:

An image is attached for reference.

(a)

In ΔAOB,

$sin 30^o = \frac{AO}{AB} \\\\0.5 = \frac{AO}{2} \\\\AO = 1 m$

In ΔBGD,

$sin 60^o = \frac{BG}{BD} \\\\0.866 = \frac{BG}{2} \\\\BG = 1.732 m$

According to the figure, BG = OE = 1.732 m

Height of the tent, AE = AO + OE

= 1 m + 1.732 m

= 2.732 m

(b)

DF = ?

In ΔAOB,

$tan 30^o = \frac{AO}{OB} \\\\0.577 = \frac{1}{OB} \\\\OB = 1.733 m\\\\\\$

According to the figure, OB = GE = 1.733 m

In ΔBGD,

$tan 60^o = \frac{BG}{DG} \\\\1.732 = \frac{1.732}{DG}\\ \\DG = 1m$

According to the figure, DE = DG + GE

DE = 1 m + 1.733 m

DE = 2.733 m

Length of the base, DF = 2 X DE

DF = 2 X 2.733 m

DF = 5.466 m

8 0

2 years ago

Identify the type I error and the type II error for a hypothesis test of the indicated claim. The percentage of adults who retir

matrenka [14]

Answer:

Type I error: D. Reject the null hypothesis that the percentage of adults who retire at age 65 is less than or equal to 62 % when it is actually true.

Type II error: A. Fail to reject the null hypothesis that the percentage of adults who retire at age 65 is less than or equal to 62 % when it is actually false.

Step-by-step explanation:

A type I error happens when a true null hypothesis is rejected.

A type II error happens when a false null hypothesis is failed to be rejected.

In this case, where the alternative hypothesis is that "the percentage of adults who retire at age 65 is greater than 62%", the null hypothesis will state that this percentage is not significantly greater than 62%.

A type I error would happen when the conclusion is that the percentage is greater than 62%, when in fact it is not.

A type II error would happen when there is no enough evidence to claim that the percentage is greater than 62%, even when the percentage is in fact greater than 62% (but we still don't have evidence to prove it).

5 0

2 years ago

Choose the three shapes that have an area of 36 square centimeters.

Kay [80]

Answer:

6cm

Step-by-step explanation:

Area of a square =

$s^2$