All categories

3 years ago

Please do not guess I have to answer this correctly! Please make sure you notice all the symobols!!

Mathematics

2 answers:

oee [108]3 years ago

8 0

Answer:

5 a - 7 b + b ^ 2 = -15

Step-by-step explanation:

Evaluation of the expression for a = - 1 and b = 5.

5 a - 7 b + b ^ 2,

Putting the values in expression,

= 5 a - 7 b + b ^ 2,

= 5 ( - 1 ) - 7 ( 5 ) + ( 5 ) ^ 2,

= - 5 -35 + 25,

= - 40 + 25,

= -15

Yanka [14]3 years ago

5 0

5 x (-1) - 7 x 5 + 5^2
-5 - 35 +25
-40 + 25
= -25

You might be interested in

What is the best jumpshot in 2k20?

torisob [31]

I'd say Isaiah Canaan or Kevin Love, Isaiah has quick reflexes and can keep up with the pace of the game, Kevin is basically assurance for anyone that they can land in the greenzone

3 0

2 years ago

A pyramid has a surface area of 539 ft.² what is the surface area of a similar pyramid that is smaller by a scale Factor of 1/7

Nataly [62]

Answer:

77 ft²

Step-by-step explanation:

Given that:

Surface Area of larger pyramid = 539 ft²

Scale factor of the smaller pyramid = 1/7

Tbe surface area of the smaller pyramid will be :

Scale factor * surface area

1/7 * 539ft²

= 539 ft² / 7

= 77 ft²

5 0

3 years ago

Some of Mrs. Turay’s eighth graders took the PSAT test. Score totals of ten of her students are below. Calculate the mean and th

den301095 [7]

Answer:

(a) Mean=74

(b) Median=70

Step-by-step explanation:

We have been given a data set of PSAT scores of Mrs. Turay's eight graders. We are asked to find mean and median of the given data set.

(a) Let us find mean of data set by dividing the sum of given scores by the number of students.

$\text{Mean}=\frac{60+62+67+69+70+70+71+75+76+120}{10}$

$\text{Mean}=\frac{740}{10}=74$

Therefore, the mean test score will be 74.

(b) Now let us find median of our given data set. We have been given that number of students is 10, therefore, our median will be the average of 5th and 6th term.

60, 62, 67, 69, 70, 70, 71, 75, 76, 120.

We can see that 5th term is 70 and 6th term is 70 as well.

$\text{Median}=\frac{70+70}{2}$

$\text{Median}=\frac{140}{2}$

$\text{Median}=70$

Therefore, the median test scores will be 70.

(c) We can see that our data set has an outlier score as 120, which has increased the mean. Mean score is greater than median score. Since median is not affected by extreme value outliers, therefore, median will be the best measure of center for given test scores.

3 0

3 years ago

Read 2 more answers

Which equation is equivalent to 10+2(x−1)+7x=3x+1?

Eva8 [605]

Answer:

Answer is x = -7/6

Step-by-step explanation:

please look at the image

8 0

2 years ago

Find two numbers whose sum is 9 and whose difference is -1

faltersainse [42]

Answer:

4 and 5

Step-by-step explanation:

Make a system of equations:

x+y=9

x-y=-1

x=9-y

9-y-y=-1

9-2y=-1

-2y=-10

y=5

Since y=5, x must be 4 since 4+5=9 and 4-5=-1

Hope this helped!

4 0

3 years ago

Read 2 more answers