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mario62 [17]
3 years ago
7

Someone help me please on these

Mathematics
1 answer:
Molodets [167]3 years ago
7 0

Answer:

Step-by-step explanation:

Triangles are similar because they have all same angles

- first triangle 35+75=110, do third angle is 180-110=70

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A recipe that serves 8 people requires 1 and one fourth cups of sugar. Using this​ recipe, how many cups of sugar are needed to
docker41 [41]

Answer:

3 1/8 or 3.125.

Step-by-step explanation:

First you would change 1 1/4 to 5/4. Then you would make a proportion of 5/4 or I like to use decimals, 1.25, over 8. Your proportion would look like: 1.25/8 = x/20. Then cross multiply 1.25 and 20 then divide your product by 8. Your final answer is 3.125 or 3 1/8. Hope this helps!

4 0
3 years ago
Q(x)=x^3+ax^2+2b is divided by (x-3) and has a remainder of 4. Find the values of "a" and "b"​
Sati [7]

Answer:

Let p(x) = x3 + ax2 + bx +6

(x-2) is a factor of the polynomial x3 + ax2 + b x +6

p(2) = 0                                                                                      

p(2) = 23 + a.22 + b.2 +6 =8+4a+2b+6 =14+ 4a+ 2b = 0

7 +2 a +b = 0

b = - 7 -2a -(i)                                                                              

x3 + ax2 + bx +6 when divided by (x-3) leaves remainder 3.

p(3) = 3                                                                                      

p(3) = 33 + a.32 + b.3 +6= 27+9a +3b +6 =33+9a+3b = 3

11+3a +b =1 => 3a+b =-10 => b= -10-3a -(ii)                                    

Equating the value of b from (ii) and (i) , we have

(- 7 -2a) = (-10 - 3a)

a = -3                                                                                          

Substituting a = -3 in (i), we get

b = - 7 -2(-3) = -7 + 6 = -1

Thus the values of a and b are -3 and -1 respectively.

Step-by-step explanation:

4 0
2 years ago
Expain the diffents between numerical expressions and algebraic expressions
Oduvanchick [21]
<h2>Numerical expressions are numbers and signs, like below.  The following are some examples of numerical expressions, numerical expressions do not use letters. 4 + 20 – 7, (2 + 3) – 7, (6 × 2) ÷ 20, 5 ÷ (20 × 3)   An algebraic expression uses letters and it says you to find "x/y/z". Example; 4+20xy-7x, (2x+3) - 7y+20.</h2>
7 0
3 years ago
Roman has 2 red pencils in his backpack if this is 25% of the total number of pencils how many pencils are in his backpack. you
lys-0071 [83]
8 because 25% is 1/4 of how much he has so just multiply 2 by 4
3 0
2 years ago
Why do you need to change the signs in -x^2+6x+m=0 ?
Goshia [24]

Answer:

It isn't necessary but having a positive coefficient for x^2 makes things like completing the square and factoring easier.

3 0
3 years ago
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