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Stels [109]
2 years ago
11

Someone help me I need help on this test

Mathematics
1 answer:
VladimirAG [237]2 years ago
3 0

Answer: the answer is B

Step-by-step explanation:

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Find the length of side y
Serggg [28]

Answer:

\large\boxed{y=76.3359\ cm\approx76.3\ cm}

Step-by-step explanation:

Use cosine:

cosine=\dfrac{adjacent}{hypotenuse}

We have

adjacent=73\ cm\\hypotenuse=y

and the angle 17°.

\cos17^o\approx0.9563

Substitute:

\dfrac{73}{y}=0.9563             <em>convert the decimal to the fraction</em>

\dfrac{73}{y}=\dfrac{9563}{10000}          <em>cross multiply</em>

9563y=730000           <em>divide both sides by 9563</em>

y=\dfrac{730000}{9563}

y\approx76.3359

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Its 15 markers, at least i would assume
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Lucy has $8.15.<br><br> She loses $3.00.<br><br> About how much does she have now
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4 0
2 years ago
Please, I NEED HELP. Anyone?
olchik [2.2K]

Answer:  

<em>(a) The system that models the situation:   b+c= 280 and 0.14b+0.07c= 22.4</em>

<em>(b) David needs 40 pounds of bread flour and 240 pounds of cake flour.</em>

Step-by-step explanation:

The amount of flour mixture is 280 lb. that is 8% plain flour.

So, the amount of plain flour in the mixture will be:  (280*0.08)lb.= 22.4 lb.

The number of pounds of bread flour and cake flour needed to make the new mixture are b and c respectively.

<u>So, the first equation will be</u>:   b+c= 280 ...................................(1)

The bread flour has 14% plain flour and the cake flour has 7% plain flour.

Thus, the amount of plain flour in bread flour =0.14b lb. and the amount of plain flour in cake flour = 0.07c lb.

<u>So, the second equation will be</u>:   0.14b+0.07c= 22.4 ................................(2)


From equation (1), we will get:   b= 280-c

Now substituting this b= 280-c into equation (2) in place of b........

0.14(280-c)+0.07c= 22.4\\ \\ 39.2-0.14c+0.07c=22.4\\ \\ -0.07c=22.4-39.2\\ \\ -0.07c=-16.8\\ \\ c=\frac{-16.8}{-0.07}=240

Plugging this c=240 into equation (1), we will get.....

b+240=280\\ \\ b=280-240=40

So, David needs 40 pounds of bread flour and 240 pounds of cake flour.

7 0
3 years ago
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