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3 years ago

Someone help me solve these three math year7 questions , thank you

Mathematics

1 answer:

dexar [7]3 years ago

8 0

Answer:

(a)input:9, output:8&12

(b)input:14,output:3&13

(c)input:7&20,output:50

(a)input:7&6,output:18

(b)input:9&8,output:12

(c)input:14&26,output:0.5

(a)+3

(b)÷3

(c)x7

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1+4=5 2+5=12 3+6=21 8+11=

Katyanochek1 [597]

<span>1+4=5 2+5=12 3+6=21 8+11=40

Explanation: 1+4=5; 2+5=7+5(the previous result)=12; 3+6=9+12=21;
8+11=19+21=40.

</span>

8 0

2 years ago

alpha and beta are the zeros of the polynomial x^2 -(k +6)x +2(2k -1). Find the value of k if alpha + beta = 1/2 alpha beta(ITS

serious [3.7K]

Answer:

$k=\frac{-11}{2}$ .

Step-by-step explanation:

We are given $\alpha$ and $\beta$ are zeros of the polynomial $x^2-(k+6)x+2(2k-1)$ .

We want to find the value of $k$ if $\alpha+\beta=\frac{1}{2}$ .

Lets use veita's formula.

By that formula we have the following equations:

$\alpha+\beta=\frac{-(-(k+6))}{1}$ (-b/a where the quadratic is ax^2+bx+c)

$\alpha \cdot \beta=\frac{2(2k-1)}{1}$ (c/a)

Let's simplify those equations:

$\alpha+\beta=k+6$

$\alpha \cdot \beta=4k-2$

If $\alpha+\beta=k+6$ and $\alpha+\beta=\frac{1}{2}$ , then $k+6=\frac{1}{2}$ .

Let's solve this for k:

Subtract 6 on both sides:

$k=\frac{1}{2}-6$

Find a common denominator:

$k=\frac{1}{2}-\frac{12}{2}$

Simplify:

$k=\frac{-11}{2}$ .

7 0

3 years ago

VXYZ is a rectangle with a length of 20cm and a width of 12 cm. The length of the rectangle is increased by 30%. The width of th

katrin [286]

Step-by-step explanation:

the area is

length × width

increasing the length by 30% means multiplying the original length by 1.3.

increasing the width by 10% means multiplying the original width by 1.1.

so, the new area is (by using the old length and width)

length × 1.3 × width × 1.1 = length × width × 1.3×1.1 =

= old area × 1.3 × 1.1 = old area × 1.43

so, the area increases by 43%.

8 0

2 years ago

How old are you now ?<br>

user100 [1]

Answer: 14

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

anthonyś yearly budget for the furniture in his house is $18,000 he spent 9% of the budget on the family room how much did he sp

nata0808 [166]

Answer:

$1620

Step-by-step explanation:

9% of budget = 0.09 × $18000 = $1620

Anthony spent $1620 on the family room.

3 0

3 years ago